Now that's a birthday suit!

Kate Hudson celebrated her 35th birthday on Saturday, April 26, at No Name in Los Angeles wearing a sexy, sequined jumpsuit. The sparkling one-piece featured a dangerous plunging neckline that stretched to her waistline. The mother of two finished the statement outfit with a demure velvet blazer and black platform pumps.

Inside the joint party with jewelry designer and wife of Tobey Maguire, Jennifer Meyer, Hudson and fiance Matt Bellamy kept close among their guests including Reese Witherspoon, Demi Moore, and Nicole Richie. "They are so in love and happy," a source at the party tells Us Weekly.

"Kate and Matt were very, very affectionate," adds another insider. "Kate caressed Matt's face and he pulled her in for a kiss. It was very sweet."

Since no birthday party is complete without cake, the ladies had theirs—and ate it too. "Once Kate saw the cakes, she grabbed Jennifer and pulled her in for a hug while everybody sang 'Happy Birthday.'"