Actress Jessica Biel watches the celebrity scramble event at the Ryder Cup PGA golf tournament Tuesday, Sept. 25, 2012, at the Medinah Country Club in Medinah, Ill. Credit: AP Photo/Chris Carlson

Jessica Biel: the ultimate cheerleader!

Justin Timberlake was back from his (well-behaved!) bachelor's weekend -- hitting the links at the 2012 Ryder Cup Captains & Celebrity Scramble held at Medinah Country Golf Club.

As the singer-actor, 31, played his hardest, his fiancee Biel, 30, proudly cheered on from the sidelines, holding a teeny-tiny parasol to fend off the sun. Grinning from ear to ear, the Total Recall actress wore skinnny, a grey top, a denim jacket and shades for the sporting event, where actor Bill Murray also played.

Set to marry Biel later this year, Timerlake had an extended bachelor's weekend which began in Las Vegas on Thursday and continued on in Cabo San Lucas, Mexico with about 20 of his pals -- including his dad.

Singer-actor Timberlake, 31, is serving as the first-ever Team Ambassador for the United States for the 39th Annual Ryder Cup.

"Golf has been a lifelong passion of mine - whether I'm out playing the game, working on the course at Mirimichi or sharing my love for the sport with others," Timberlake said. "It's going to be a special week for golf fans around the world, me the most."