Apart from Super Bowl celebrations, Justin Timberlake and girlfriend Jessica Biel had something extra to celebrate.

Biel, 26, threw her singer beau a Super Bowl-themed surprise birthday party in the Hollywood Roosevelt Hotel's ultra-exclusive penthouse on Sunday afternoon, E Online reported.

Justin was totally blown away when he walked in. He had no idea, says a source.

Around 100 friends and family of the couple, including both of their parents, Biel's brothers, Timberlake's cousins and his best friend Trace Ayala, joined the party to celebrate his 28th birthday.

Leona Lewis, the Bleeding Love singer was also there to join the festivities.

The party group watched the Pittsburgh Steelers triumph over the Arizona Cardinals on two big-screen plasmas, while feasting on gourmet buffalo wings, pizza, mini sliders and cupcakes.

Jessica was in a simple black cotton dress and flats, and worked the room like the perfect hostess, the source said.She took breaks to sit with Justin, hold hands and relax.

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