How Sofia Vergara and Joe Manganiello Spent Their First New Year's Eve Together

— -- Sofia Vergara and Joe Manganiello had a great 2014, and they capped it off together.

The actors, who were first linked earlier this year and reportedly got engaged over the holidays, spent their first New Year's Eve together in Las Vegas.

The "Modern Family" star, 42, and her "True Blood" actor beau, 38, rang in 2015 at Planet Hollywood Resort & Casino, alongside Arnold Schwarzenegger, where they took in a performance by Britney Spears.

"Excited for the new year!!!! Wishing everyone a lot of work and happyness [sic]!!!" she wrote on WhoSay.

But they weren't the only celebs who celebrated last night! See photos and videos from some of your favorite stars, below.

Usher hosting E11EVEN Miami's party

Beyoncé

Justin Bieber

Khloé and Rob Kardashian in L.A.: "I brought in the New Year with my best friend in the entire world @robkardashian! We just finished watching 'Gone Girl' at home! The perfect way to start off the year with my perfect boy ?? 'Gone Girl' was one CRAZY ass movie! Definitely a must see! Stay safe out there!!! Xo"

Lena Dunham

Hilary Duff: "Happpppppy 2015!!! Love to everyone!!! Make this year count! #notmakingittomidnight"

Taylor Swift after her performance in Times Square: "Hi 2015"

Kendall Jenner from Dubai: "sandy Balmain"

Elton John from Brooklyn: "Getting ready to rock in 2015 in NYC. Happy New Year Everyone!!!!!!!