Your favorite stars have been taking on the town and celebrating the holiday season in an array of ways. We have the pictures to prove it!

Fergie, 37, and her husband Josh Duhmel, 39, want children, but right now, the married couple aren't expecting. The singer, known for her taunt physique, admitted that she put out a few pounds, and that's why everyone has been saying she has a bun in the oven.

Will.i.am will broaden his fan base on an intergalactic level. NASA's Curosity rover will play Black Eyed Peas' lead singer Will.i.am's single, "Reach for the Stars," through their speakers on the planet Mars on Tuesday, Aug. 28. NASA will live stream Curosity playing the single from the surface on the Red Planet at 1pm (PST) or 4PM (EST) as part of an educational event for students.

Justin Bieber is writing and producing tracks for Selena Gomez's next album. Bieber is said to have played one of his girlfriend's unfinished tracks for Black Eyed Peas' will.i.am. The music producer, who has worked with Michael Jackson, Usher described the song as "dope". "He was like, 'Yeah, I wrote it for Selena.' It's great," will.i.am told Canada's New Music Live. "And it was really awesome. It was really, really dope."