It’s officially 2015, everyone! Have a look at all the best celebrity tweets and greetings to wish you a Happy New Year. This New Year’s Eve, celebrities including One Direction, Taylor Swift, Idina Menzel, Elton John, Fergie, and many more performed for millions of viewers. Once again, Ryan Seacrest teamed up with Jenny McCarthy for Dick Clark’s New Year’s Rockin’ Eve, while Kathy Griffin spontaneously dyed Anderson Cooper’s hair on CNN. Carson Daly and Pitbull hosted events as well.