Credit: Chris Jackson/Getty Images

Bump watch!

British singer Lily Allen, 25, showed off her growing belly at the London premiere of Tamara Drewe Monday.

"Its Elle magazine's 25th birthday issue this month," Allen tweeted before the premiere. "There's a party tonight to celebrate but I can't go. Sorry Elle. It's the premiere for my mum's film Tamara Drewe, so I'm going there instead." See more photos of Lily's baby bump!

Allen -- who is expecting her first child with boyfriend Sam Cooper after suffering a miscarriage in January 2008 -- admits that she's still adjusting to her pregnancy curves.

PHOTOS: Mommy lifesavers!

"I'm aware of the fact that I've put on a considerable amount of weight, and I didn't want it to become a talking point," she tweeted in August just after confirming her pregnancy. "I'm feeling vulnerable enough as it is. Hence the jeans and pyjama top. Just wanted to be relaxed and not think about all that."