VIDEO: Sneak Peek - Justin Bieber Gives Teen Surprise of Her Life on Tonight's KNOCK KNOCK

Below, watch Justin Bieber give a 15-year-old the surprise of her life in a sneak peek from tonight's KNOCK KNOCK LIVE, aiting at 9/8c on FOX.

Tune in to KNOCK KNOCK LIVE tonight to see more of Justin Bieber, Jeff Gordon and more.

Hosted by iconic TV and radio personality Ryan Seacrest, new unscripted series KNOCK KNOCK LIVE, is a can't-miss, life-changing weekly television event packed with unpredictable and thrilling surprises that enlists friends, families, neighbors and celebrities to help grant wishes with one simple knock on the door.

OFFICIAL SHOW WEBSITE: fox.com/knock-knock-live

OFFICIAL SHOW TWITTER: @KnockKnockFOX / #knockknock

OFFICIAL SHOW FACEBOOK: facebook.com/KnockKnockFOX

OFFICIAL SHOW INSTAGRAM:@knockknockFOX