What a Birthday weekend Taylor Swift had. The Shake It Off hit maker started the celebrations with a killer performance at the Kiss 108 Jingle Bell Ball. Before herding her celebrity pals in to a van for a pizza party back at her Tribeca apartment. The 25-year-old star, who was wearing the same tartan outfit she wore on stage, arrived back with her guests at 12:30amAmong the guests were Karlie Kloss who walked to the party, Justin Timberlake who arrived with a David Bowie Album as a gift. Actress Emma Roberts, close pal Selena Gomez and 5 Seconds of Summer's Michael Clifford who brought the best gift of the night. Even the King and Queen of hip-hop, JayZ and Beyoncé, were there to party with the pop princess.