The stars were out in force at the Grosvenor House Hotel in London Last night for Gary Barlow’s BBC Children in Need charity gala.
Fellow X Factor judge and all-round babe Nicole Scherzinger was one of the first to arrive at the star-studded bash.
Cowell, 53, is expecting his first child with US socialite Lauren Silverman, 36, and, according to Louis, the couple are like “two teenagers dating”.
Speaking at the launch of The X Factor, show judge Louis said Cowell could rejoin the show next year – but only if he is not too busy with his new life.
Louis, 61, said: “He’s fantastic on the show because he makes everyone work hard. But he’s got to fit in looking after a baby now – and maybe getting married. Totally. I think it’s a possibility, I really do.”
He said music mogul Cowell was “old-fashioned” when it came to parenting and would want to get hitched to the mother of his child.
Yesterday Cowell admitted he had not ruled out marriage, but he teased: “You’ll have to wait and see.” He said he was still getting his head around the news that he was to become a father.