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Lady Gaga emerged from a London hotel on Wednesday wearing what appeared to be a hot pink sperm hat on her head.

She likes wearing protection.

Looking like retired snowbirds, Aerosmith members Joe Perry (left) and Steven Tyler (right) showed off their sixtysomething rock-n-roll bods and posed for a shirtless pic while at the beach in Maui on Tuesday.

Britney Spears went green in Rio by showing off all her environmentally sound bits in a bright emerald two-piece bathing suit on Tuesday.

The 29-year-old mother of two is doing her part to make the world a better place.

Leonardo DiCaprio may have reason to hide ... because the environmentalist wasn't very green as he arrived in Sydney Monday ... on a private jet.

In the past, Leo's camp has claimed the 37-year-old "J.Edgar" star occasionally flies private when he has to get to remote locations.

Sydney may have kangaroos, but it's not remotely remote.

A source close to Leo tells TMZ ... he simply hitched a ride with a plane that was already headed to Australia.

After having to cancel shows in Sweden for the flu and exhaustion in the last couple of weeks, Rihanna was back to her healthy and gorgeous self in shades, a fur vest, shorts and sexy garters in England this weekend.

The 23-year-old resumed her European tour with a couple of nights at London's O2 Arena.

Kendall Jenner emerged from her sweet 16 dinner last night (with sister Kim among the guests) to find her present -- a brand new, bow-tie wrapped Range Rover -- waiting for her outside.

Must be nice.

Vanessa Williams and Kim Kardashian were at the Atlanta airport early this morning, hopping a flight back to Los Angeles after shooting scenes for Tyler Perry's movie, "The Marriage Counselor."

Vanessa and Kim make a fun pairing ... both had to overcome sex scandals early in their careers before they rose to superstardom.

With temperatures only in the '50s in L.A. this weekend, it was up to gorgeous Rebecca Romijn to bring on the heat in her sexy two-piece bikini.

The 39-year-old mother of two braved the cool weather and showed off her smokin' hot body while on a photo shoot.

This photo was taken moments after Avril Lavigne was allegedly attacked by 5 drunken morons at the Hollywood Roosevelt Hotel early Sunday morning.

One day after Kim Kardashian flew to Minnesota to talk things out with estranged husband Kris Humphries, she arrived at LAX last night looking ... like she'd been talking things out with an estranged husband.

Kim was also seen boarding the plane in Minnesota (below), where she clung to a giant pillow as she got ready for the late flight home.

Kim Kardashian was seen making a phone call outside the home of Kris Humphries this afternoon in Chanhassen, MN.

As TMZ first reported, Kim flew in to Minnesota last night to talk to Kris face-to-face ... but no reconciliation is expected.

Kris was spotted leaving the home later in the day.

Arnold Schwarzenegger took a nice gander at soon-to-be ex-wife Maria Shriver today as they went in to church in Santa Monica, CA.

Brody Jenner was bleeding from the forehead last night as he made a phone call following a fight inside the Hollywood Roosevelt Hotel.

Lindsay Lohan will be turning herself in to jail any day now ... so she enjoyed one of her last night's on the outside by hitting up the popular Venice sushi joint Wabi-Sabi.

Selena Gomez and Justin Bieber held hands as they entered an MTV Europe event in Northern Ireland this evening.

With the fate of Conrad Murray still hanging in the balance, Michael Jackson's children -- Prince, Blanket and Paris (in the white hat) -- went to the movies last night and saw "Tower Heist."

According to our sources, Katherine has been filling the children in on the details of the trial herself -- she'd rather they hear it from her and not through anyone else.

We're told when the verdict comes down, Katherine will be the one to tell them the news.