Let the bump watch begin! 

Days after Usmagazine.com broke the news that Rebecca Romijn and Jerry O'Connell are expecting twins, the mom-to-be, 35, returned to work. 

She showed off a mini bump on the set of Ugly Betty earlier this week. 

Her co-stars couldn't help but gush about the pregnancy. 

"She is so happy — she is going to be such a great mom!" Ana Ortiz told Usmagazine.com at the NYC premiere of Sisterhood of the Traveling Pants 2 on Monday. "She’s a kid herself, and so is Jerry. Those kids are the luckiest people. I can’t wait to meet them!" 

Added co-star Becki Newton: "I love the idea of a couple like that having babies! 

"It’s so great. We’re really, really happy for them. They're great people! The babies will be stand-up comedians!" 

Romijn and O'Connell, 34 — who wed last July — will greet their babies this winter. 

"They did not use fertility treatments," a source says in the new issue of Us Weekly. 

O'Connell told Us last month that they had been trying to have kids for some time, adding that the process had been "a lot of fun." 
 

Source