One Direction shows Simon Cowell their personalized onesies for his future baby on the 1D Day live stream on Nov. 23. Credit: Jeff Kravitz/FilmMagic

The luckiest future baby ever! Simon Cowell and his pregnant girlfriend Lauren Silverman were surprised during the Saturday, Nov. 23 live-streaming 1D Day event, filmed in Los Angeles with British boy band sensation One Direction. 

The lads from across the pond presented their acerbic mentor with some adorable onesies features each member's face. They then ushered a very pregnant Silverman, 36, on stage to show off her future baby's new duds. Harry Styles helped her on stage and even offered her his chair.

The blushing mommy-to-be was very grateful for the gifts, holding them up and thanking the boys. Cowell seemed convinced he was having a boy. And as for baby names, the notorious X Factor judge said he couldn't think of a better name than Simon.  

One Direction's live stream aired for seven hours on YouTube. Styles was notably asked about his possible relationship with 18-year-old Kendall Jenner by Piers Morgan, but the British bachelor said they'd only gone out to dinner and weren't dating