From the beach to the streets, stars were out and about this week while ringing in the new year and celebrating with friends and family. Gwyneth Paltrow , Rihanna , Charlize Theron , and more hot ladies flaunted their figures in bikinis, while Gwen Stefani  shared a sweet, snowy moment with her son, Zuma Rossdale. Britney Spears  was on fire during her first performance in Vegas, and Kaley Cuoco and Ryan Sweeting's PDA definitely warmed up the crowd at their New Year's Eve wedding . Read through to see all that and many more of our favorite shots this week!
Nick Lachey put his buff body on display  while spending time with his wife, Vanessa, and their son, Camden, on the beach in Cabo on Tuesday.
Charlize Theron  showed off her enviable bikini body when she hit the beach in Hawaii  on Monday.
Demi Moore  flaunted her fit figure while spending the holidays in Cancun  with her daughters and new boyfriend this week.
Kristen Stewart was all smiles  while grabbing coffee with a friend in LA on Saturday.
Gwyneth Paltrow showed off her figure  in a bright pink bikini while vacationing with her family in Hawaii this week.
Gwen Stefani  and her son, Zuma Rossdale, shared a sweet moment  during a slope session in Mammoth Lakes, CA, on Wednesday.
Jennifer Aniston was all smiles  during her bikini-clad Cabo vacation this week.
Stephanie Seymour showed off her rocking body  during a family beach day in St. Barts on Saturday.
Angelina Jolie and Brad Pitt shared a cute moment  at the ice skating rink during an outing with their kids in Australia on Monday.
Josh Hutcherson waved to the crowd during a Kentucky Wildcats game on Saturday and was given the signature Mockingjay salute  — a solemn, silent three fingers in the air — by thousands of fans.
Kaley Cuoco and Ryan Sweeting  brought on the PDA during their wedding  on Tuesday night.
Kim and Kourtney Kardashian  hit the slopes in Park City, UT, with Kanye West  on Monday.
Britney Spears kicked off  her two-year Las Vegas residency with a fiery performance at Planet Hollywood on Friday night.
A bikini-clad Rihanna hit the beach  for some sun and fun in her native Barbados this week.
AnnaLynne McCord  and her boyfriend, Dominic Purcell, showed PDA on the beach  in his native Sydney, Australia, on Wednesday.