Birthdays

Blac Chyna is pissed at Tyga for jacking her Ferrari birthday party plans for their son, and adding his own bells and whistles to outdo her ... and she smells a rat behind the whole mess.

A source close to Chyna tells TMZ ... she believes a production staffer on her reality show fed Tyga and Kylie Jenner all the details of her party for King -- which she spent 2 months planning. We're told Tyga and Kylie were invited to the Saturday event, but no-showed ... then threw their bigger copycat bash the next day.

Chyna says she's happy her son enjoyed the birthday double up, but as a mother ... it was a slap in the face. Plus, it's insult to injury if someone from her own show tipped off her enemy.

Co-parenting. It ain't for everyone.

Justin Bieber isn't dating a kid anymore -- his new girl, Sofia Richie, is now the BIG 1-8.

Justin and Sofia got their juice on Tuesday in North Hollywood, the day before she officially became a woman ... in age, anyway. They hadn't been seen together for about a week while Justin was overseas performing at a British music festival.

Now they're not only reunited -- they're legal! You can stop cringing.

Blac Chyna had a serious moneymaker on display for her 28th birthday party at a Miami strip club -- and we ain't talking about her ass.

Her 4-tier cake came fresh out of Dollface Delight Cakery in Miami, and we've learned biz is booming at the bakery since the high-profile gig at G5ive. Owners, and sisters, Raquel and Christina Basil tell us they whipped up their creation in 16 hours, but the hard work has paid off -- they've gotten nearly double their usual orders.

Who knew cake lovers hang at strip clubs on the reg?

The sisters say BC's cake would normally cost between $1,100-$1,300, but they only charged $500 since only the giant gold ribbon and the bottom tier were edible. Delicious buttercream cake, btw. Best of all ... BC actually got to have her cake and eat it too, since she's got a little Kardashian on the way. No word if Rob Kardashian took a cheat day.

The most popular agent in town attracted more celebs than the Golden Globes can only hope.

CAA agent Cade Hudson had a birthday bash Wednesday night at Palm restaurant in Beverly Hills. The rain didn't stop a swarm of celebs from dining on steak and lobster, including Gwyneth Paltrow, Sean Penn, Kate Hudson, Joe Jonas, Paris Hilton, Nicky Hilton, Ryan Phillippe, Bella Thorne, Seth MacFarlane, Rachel Zoe, Amanda Seyfried, Suki Waterhouse, Emma Roberts, Francesca Eastwood, Jeff Beacher,Amber Valletta and Dylan Penn.

If Cade gets 10% from all of them, that's a lot of cash ... and cake.

Raven-Symone couldn't get the real Kim Kardashian and Kanye West to celebrate with her for her big 30th birthday, so she opted for the next best thing.

The Weeknd and Ed Sheeran don't just spare change for homeless vets in the street ... they drop bills, as one lucky guy found out.

The singers happened to leave Leo DiCaprio's birthday party Wednesday night in NYC right after each other, and both were approached by a guy who said he's an ex-soldier just looking for a warm meal.

The fact it was Veteran's Day probably helped his cause ... plus, it's been a really good year for Ed and Weeknd. But ultimately, we think it was the guy's hustle that scored him some cash.

Kardashian family matriarch Kris Jenner turns 60 on Thursday ... but she certainly doesn't look it!

Simon Cowell celebrated his 56th birthday with Ryan Seacrest, his GF ... and a 'Real Housewife.'

We're told Cowell's baby mama Lauren Silverman set up everything for the celebration dinner at Sur Lounge in West Hollywood ... where celeb guests included Ryan, designer Rachel Roy, and Lisa Vanderpump. Makes sense, since it's her restaurant -- plus, we're told LV and Silverman are longtime pals.

Seacrest surprised Cowell with a mini Maybach. The ex "American Idol" co-stars have a running joke about Cowell's 5'9" height ... which is funny, coming from Seacrest.

Based on Simon's reaction, size doesn't matter to him. Not on his birthday at least.