(Photo Credit: khloekardashian/instagram)

Saturday was a popular day for celebrity celebrations. A member of reality royalty turned 16, the fiance of Hollywood's sweetheart turned 42 and Britney Spears' ex got married in Sin City. While you may have missed all the fun, here are all the details:

• Jennifer Aniston threw a 42nd birthday bash for fiance Justin Theroux at her 8,500-square-foot Bel Air mansion, reports People magazine. As expected, the guests were A-list only, including Ellen DeGeneres, Don Cheadle, Kristen Bell and Ben Stiller.

Watch: Jennifer Aniston Throws Birthday Blowout for Fiance

• Britney Spear's ex-husband Kevin Federline is off the market. Multiple reports have him married to Victoria Prince in Las Vegas. Prince tweeted pictures and videos of the couple, and their daughter, Jordan Kay along with hastags #thefedz, #vivalasvegas to celebrate the occasion. The couple has been together since 2008.

Related: Kim Kardashian Loves Amanda Bynes, Wants Her Better

• Kylie Jenner celebrated her Sweet 16 in true Kardashian style at Nobu in Malibu. Sis Khloe Kardashian Odom posted a pic of the event on Instagram alongside the caption "The Birthday baby! Cake cake cake @ kyliejenner." Kourtney Kardashian also posted a close-up of the cake, which read "Happy Sweet 16 Kylie" in pink letters on a white icing heart. To top it all off, Kylie's mom, Kris Jenner, posted "Happy Birthday my beautiful Angel girl @kyliejenner I love you sooooo much."