Jack Black helped a fan propose to his girlfriend at the premiere of new film KNOCKED UP on Monday night (21May07) after the shy groom-to-be lost the nerve to get down on one knee. Black, a guest of director Judd Apatow - the loved-up fan's cousin, stepped up to act on the poor guy's behalf, to help the moviemaker out of an embarrassing situation. Apatow told the audience his relative had planned to ask his girlfriend to marry him at the premiere - but ran out of courage as the big moment arrived. Funnyman Black took over, got on one knee in front of the shocked fiancee-to-be, and said, "Of all the people I have ever known, you are the one I love the most on this planet and on every planet." Black then crooned Journey's Don't Stop Believin' before asking the giggling girl in front of him to 'marry' him - and she agreed.