Too cute!

A celeb we love just Tweeted this squeeze-worthy baby picture of her and her sister ... can you guess who it is? Find out after the jump!

New mom Marion Cotillard must be feeling the stress of a new baby!

We spotted the Oscar winner at LAX on Saturday, where she went without makeup as she pushed new baby Marcel through the airport.

Marcel was born in May, and Marion has consistently worked since; the French actress has been busy with everything from ad campaigns to filming The Dark Knight Rises.

Maria Shriver stopped by a Beverly Hills salon on Saturday to get her hair blown out, though she wasn't her usual chipper self.

The activist left looking lovely, but somber. She mostly kept quiet in the salon, reading magazines and listening to music. Shriver is mourning the loss of her cousin, Kara Kennedy, who died at age 51 on Friday. The cause of death has not yet been revealed, though she had battled cancer.

Shriver Tweeted on Saturday, "Thank you for your heartfelt thoughts, prayers and condolences for my cousin Kara. She was a kind soul who loved her family."

But, as always, Maria had to remain strong for her family. Her son, Patrick, with estranged husband Arnold Schwarzenegger, celebrated his 18th birthday on Sunday.

Meanwhile, our photogs also spotted Schwarzenegger out in Beverly Hills ...

Supermodel Heidi Klum picked up daughters Leni and Lou at ballet class in Beverly Hills on Saturday, where Leni looked like a prima ballerina ... until she let out a shriek!

Maybe Leni was screaming about her mom's new status on the annual "Most Dangerous Celebs" list released by McAfee Security. Klum replaced Cameron Diaz as the celebrity most likely to lead Internet users to a virus if they search for her name -- scary!

We still love you, Heidi ... and you too, Leni.

Our hearts are melting!

Denise Richards brought adorable new baby girl Eloise to pal Tori Spelling's baby shower in Malibu on Saturday, where our photogs snapped pics of the little one's too-cute-for-words face!

Richards Tweeted post-shower, "@torianddean thanks for having me... What a lovely day!! So happy for you and your family!"

Also in attendance were Brooke Burke, Lisa Rinna, The Real Housewives of Beverly Hills' Kyle Richards and Millionaire Matchmaker's Patti Stanger. But Eloise stole the show ... and our hearts!

So nice to see Anne Hathaway so happy and in love!

The actress took a break from filming The Dark Knight Rises to get breakfast with boyfriend Adam Shulman in Los Angeles on Saturday.

The two have been dating since late 2008, but they look like a new couple! Too cute.

Tori Spelling is really making herself out to be the next Martha Stewart!

The actress/reality starlet celebrated the newest addition to her family with a baby shower in Malibu on Saturday, where she treated her guests to tons of do-it-yourself activities, including homemade scrapbooks and jewelry.

Guests included Denise Richards and Lisa Rinna (below), along with Brooke Burke and Bravo stars Kyle Richards and Patti Stanger.

Kim Kardashian has been in NYC filming the upcoming season of Kourtney & Kim Take New York, but she's apparently getting sick of the Big Apple!

We caught up with Kim in New York on Saturday, where she looked a bit perturbed as she walked the cloudy city streets with PR pal Jonathan Cheban.

Seems she misses sunny LA! Kim Tweeted Saturday night, "Back to LA and I can't wait! I need my own bed even if it is just for a few nights!"

Maybe that NYC penthouse suite just isn't doing it for her.