Heidi Klum and BF Couples House Hunting Scoping Katy Perry's Mansion

Heidi Klum and her rebound guy are getting super serious ... like, buying a house together serious ... and one of the places they're checking out is Katy Perry's L.A. mansion, TMZ has learned.

Heidi and her boyfriend Martin Kristen have been house hunting all over L.A. recently -- and sources tell us they're looking for a "family home" that has enough space for the couple and Heidi's 4 kids.

We're told Klum knows exactly what she wants -- she wants to be east of the 405 Freeway and needs 4 bedrooms for the kids that are ALL located on the same floor as the master.

Enter Katy Perry -- who still owns that incredible mansion in the Hollywood Hills that she purchased in 2012 with then-husband Russell Brand ... which has everything Klum is looking for.

Klum and Kristen biked over to the place last week to check out the 7 bedroom, 11 bathroom estate ... and we're told they were impressed.

It could be a perfect situation for Katy -- who recently reduced the asking price of her sprawling dream palace to $6.495 million hoping to motivate buyers.

Whoever snatches up the place is gonna get a helluva property -- it's like a real-life castle, complete with a lagoon-style pool and views to die for.

There's even room if Seal wants to crash ... though we're guessing that probably won't happen.

Katy Perry I Can't Unload This Damn House!

The housing market may be bouncing back for a lot of people, but not Katy Perry, because we've learned she's about to list her Hollywood Hills house for WAY less than the purchase price.

Katy bought the house with Russell Brand when they were married. She has full title and has been quietly trying to sell it for a long time, but she's not getting anywhere near the $8 million she wants.

Katy wanted to avoid putting the house in the multiple listing service -- which is the Paul Revere of the real estate world. She wanted to sell the house on the down-low, but it's just not happening.

We've learned she's agreed to put the house in the MLS in 2 weeks, and she'll reduce the asking price to the mid 7s -- as in millions. But here's the deal ... Our real estate sources say she'll definitely sell it if someone offers in the high 6s.

The real estate market ... hot again for most -- cold for Katy.

Katy Perry & Russell Brand Ignore Each Other at Lakers Game

Trying not to make eye contact, former couple Katy Perry and Russell Brand sat on opposite sides of the court at the Lakers game at Staples Center in L.A. on Tuesday.

Both Katy and Russell -- who divorced earlier this year -- employed one of the hardest acting techniques known to man ... pretending it's not awkward when you run into your ex.

At least they can agree on which team to root for.

(For the record, the Lakers lost to the Mavs.)

Katy Perry, Russell Brand Officially Single

Katy Perry and Russell Brand have officially severed ties -- their divorce became final today.

Russell filed for divorce at the very end of 2011, and the settlement was hashed out quickly, but it takes a full 6 months before a divorce in California can become final.

We broke the story ... even though there wasn't a prenup, Russell walked away from half of the $44 million fortune that Katy racked up during their 14-month marriage.

Even though they had to wait for a legal divorce, they didn't wait to move on. Both have been seeing other people for months.

Tom Cruise Victim of the 'Rock of Ages' CURSE?

Divorces, violence, and even a racial controversy -- it seems the "Rock of Ages" cast has been smothered in bad fortune from the moment the project began. It's almost like ... THEY'RE CURSED!

Think about it ...

Tom Cruise -- "Blindsided" with divorce papers from Katie Holmes ... who filed in New York instead of California because she's gunning for sole legal custody of their daughter.

Russell Brand -- Marriage to Katy Perry goes belly up after production begins on "Rock" ... later investigated by police in New Orleans for smashing an iPhone belonging to a paparazzo.

Mary J. Blige -- Engulfed in racial controversy back in April ... after she was featured singing about fried chicken in a Burger King commercial. Mary's charity's went broke and was sued after failing to pay back a $250k loan.

Alec Baldwin -- Kicked off a flight in Dec. after screaming at a flight attendant who asked him to stop playing "Words with Friends." Later went to cops to report an alleged stalker. Investigated by the NYPD after allegedly attacking a photog.

Julianne Hough -- We can't think of anything ... yet ... but don't say we didn't warn you.

Katy Perry Sucking Face with New Man

The rebound is officially underway for Katy Perry ... who was all about the PDA with her new man at Coachella ... hugging, caressing and full on making out.

The guy is Robert Ackroyd -- the guitar player for Florence and The Machine.

The two were also spotted together at the music festival last weekend ... and according to some reports, Katy was already referring to him as her "boyfriend."

Guess she's finally ready to move on from her soon-to-be ex-husband Russell Brand -- who filed for divorce back in December.

As TMZ has previously reported, Brand and Perry have been on relatively good terms since the breakup ... with Brand refusing to make a play for any of the millions of dollars Perry raked in during their relationship.

Russell Brand to Katy Perry You Can Have the House

Russell Brand is one step closer to severing all ties with Katy Perry -- because he's surrendered his interest in the house they bought together while they were happily married -- if they were ever really happily married.

TMZ got hold of a quitclaim deed that Russell filed in L.A. ... giving Katy all rights to the $6.5 million house -- lock, stock and barrel.

Sources tell us ... it's all part of the property settlement agreement between Russell and Katy.

It's further proof of what Russell said -- that he doesn't want a penny of Katy's money and wants the split to go as amicably as possible ... so far, so good.

Katy Perry Mystery Dude Proof They're NOT Dating

Katy Perry and a hot guy who's definitely not Russell Brand stepped out in L.A. -- but we have solid evidence the BF is waaay more likely to be a BFF. Drift caught?

Check out TMZ on TV -- click here to see your local listings!

Katy & Russell No Prenup, No Regrets

Katy Perry and Russell Brand never entertained the idea of signing a prenup -- and if they could do it all over again ... they wouldn't have changed a thing, sources close to the couple tell TMZ.

According to sources, Katy and Russell's marriage happened so fast, they never really had the opportunity to summon their lawyers and hash out a prenup ... nor did either really believe they needed one.

We’re told both felt comfortable one wouldn’t screw the other in the event of a divorce -- they both knew where the other person stood on money, life, religion ... everything.

TMZ broke the story ... Russell refused to accept $20 million of Katy's money he was entitled to as part of the divorce -- exactly half the money she made during the course of their marriage.

Sources tell us, Russell was never a materialistic person and never spent much -- he never got into entertainment for the money.

As one source put it, "Russell is a very simple person who doesn’t need much to make him happy."

The source adds, “He would never take money that [Katy] earned. That’s not Russell. And if it was the other way around, Katy wouldn’t have taken it either. They respect each other too much."

Where is Hollywood and what have you done with it?!?!

Russell Brand Champ or Chump ... Let's Play the Game

Russell Brand is either a champ or a chump for turning down a $20 million divorce payday -- and the only way to figure it out ... is to play Harv's version of "Family Feud."

Katy Perry Divorce Taking Back Her Name ... Along with Her Millions

Katy Perry's not only keeping all the cash she made during her marriage to Russell Brand -- she's also taking back her maiden name ... according to new divorce docs.

Katy's response to Russell's divorce filing -- filed yesterday and obtained by TMZ -- states the ex-couple reached a "comprehensive written settlement." As we first reported, that includes Russell passing on their community property -- aka 50% of Katy's approximate $40 million in earnings!

The doc also includes a check next to the box -- "Respondent's [Katy's] former name be restored to." It goes on to specify her full name ... Katheryn Elizabeth Hudson.

Most amicable Hollywood divorce. Ever.

Russell Brand to Katy Perry: I Don't Want Your Money

Russell Brand is entitled to approximately $20 million of Katy Perry's fortune ... but TMZ has learned he will not take a single penny of it.

Russell's lawyer filed final divorce papers Tuesday ... although the judge will make the divorce official on June 30, because there's a 6 month waiting period.

Informed sources tell TMZ ... Russell and Katy did NOT have a prenup. As a result, everything they earned during their 14-month marriage is community property -- which means they're each entitled to 50% of the pot.

Katy made $44 million between May, 2010 and May, 2011 -- according to Forbes. The couple married in October, 2010, so Russell could have scored a fortune if he exercised his community property rights.

But here's the deal. As one source put it, "This divorce is as amicable as it gets, and Russell was a mensch (Yiddish for a good person)." He doesn't want Katy's money. He's happy to walk away with the money he earned -- which is far less than what Katy raked in.

So we gotta ask ...

Katy Perry First Big Night Out Since Split with Russell Brand

Katy Perry made her first big public appearance in the U.S. since her split with Russell Brand last night ... posing on the red carpet with her BFF, jewelry designer Markus Molinari, at the grand opening of 1 OAK Las Vegas at the Mirage Hotel & Casino.

Even though Katy was on the flyer for the event, our guy inside says Katy never addressed the crowd and stayed in her booth (behind a wall of security) for the entire night.

Baby steps.

Katy Perry Flashing Her Pearly Whites

Katy Perry was all smiles on Thursday, spotted on the Santa Barbara set of a photo shoot for Adidas.

Perry's now sporting a new blue hairdo, but she was sans wedding ring.

Russell Brand was spotted Friday for the first time since the divorce news broke, arriving at LAX with a throng of paparazzi waiting for him.

We're told the couple is on good terms, despite the divorce.

Russell Brand Back in the US of A

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Russell Brand returned stateside last night, arriving at LAX where he was greeted by a slew of his closest friends ... the paparazzi.

Brand has been in London ever since filing for divorce from Katy Perry. She resurfaced for the first time Thursday, posing with a fan in Santa Barbara on the set of an Adidas commercial.

As for Russell ... the paps threw a few divorce questions at him as he made his way to his car ... and got nothing but silence.

Katy Perry The Post-Split Blues

Rocking some interesting blue hair, Katy Perry was spotted out in public on Thursday for the first time since splitting with estranged husband Russell Brand two weeks ago.

The 27-year-old "California Gurl" was all smiles as she posed with a fan while on the set of an Adidas commercial she is filming in Santa Barbara.

As TMZ previously reported, Katy will continue living in the former couple's $6.5 million Hollywood Hills home and Russell will move out.

While Russell filed for divorce after only 14 months of marriage, he and Katy are said to still be on reasonably good terms.