Jessica Biel threw a surprise birthday party for boyfriend Justin Timberlake over the weekend.

Approximately one hundred guests, including charttopper Leona Lewis, were invited to celebrate Timberlake’s 28th birthday at The Hollywood Roosevelt Hotel on Sunday.

“Justin was completely blown away when he walked in,” an insider tells E! News.

Party menus includeded buffalo wings, pizza, mini sliders, and homemade cupcakes as guests enjoyed the Super Bowl.

“He thought they were just checking into the hotel and heading to another Super Bowl party. He stopped dead in his tracks when he opened the door and then gave Jessica a kiss.”

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