David was on "This Morning" in the UK today to talk about his upcoming concert, "David Hasselhoff Live."Listed in The Guinness Book of World Records as 'the most watched TV star in the world' thanks to starring roles in both Knight Rider and Baywatch, David Hasselhoff is now inviting us to spend an intimate evening with him as he brings his show to the UK. Promising to deliver a night of song, dance, and laughter, David will be offering the audience a hilarious behind-the-scenes look at his life.He joined "This Morning" to tell them more about a show that regards audience participation as compulsory.David was surprised when Donny Osmond invaded the set and demanded his autograph during the live TV interview.The Baywatch legend made an appearance on British chat show This Morning and was discussing plans for a movie version of his hit 1990s TV drama when fellow guest Osmond ran into shot.Osmond leaped onto the sofa where Hasselhoff was sitting, put his head in the actor's lap and said, "Will you sign my hand?"Hasselhoff was happy to join in the prank, pretending to autograph Osmond's digits before performing a mock heart-resuscitation on him.The bizarre stunt left Hasselhoff looking bewildered, as Osmond walked off the set, telling him, "I love you, man."If you're in the UK, you can check out the video here.