It's official! Bollywood's young heartthrob Imran Khan is engaged to his sweetheart and longtime girlfriend, Avantika Malik. And although the actor is keen on making the formal announcement only in January, the industry has already raised a toast to the couple. “Yes it's true. But we're planning to have a proper ceremony later, so right now it's just for us and our families,” admitted Imran refusing to reveal the wedding date. But, a source said, “Imran had thrown a surprise party for Avantika on her birthday on July 18, a very private affair, with only very close family and friends present. There he surprised everyone by proposing to Avantika. Amidst much cheering, she accepted.”