There really must be something in those designer water bottles.

Add model-turned-actress Devon Aoki to the 2011 celebrity baby-on-board watch.

The "Rosencranz and Guildenstern Are Undead" star, who last year announced her engagement to handsome financier James Bailey, has confirmed her pregnancy to the New York Post's "Page Six." No due date was provided.

"Devon and James are extremely happy," her rep told the newspaper. "They became engaged over the summer and she just found out that she is pregnant."

Aoki, the 28-year-old daughter of Benihana restaurant chain founder Rocky Aoki, has been modeling internationally since age 14. In July 2010, the former face of Versace was featured flaunting her prepregnancy curves in V magazine's annual sexy-body issue.

Not that pregnancy will stop the "Sin City" star from having a model figure. StyleList wouldn't be surprised if Aoki followed the likes of new mom Miranda Kerr by displaying her growing bump on a catwalk or posing nude on a magazine cover somewhere soon. Although Aoki's rep did tell the newspaper she plans to take some time off to nurture her newborn.

Aoki will have plenty of company if she wants to start a celebrity mommy-and-me group. Invitees could include the likes of Rachel Zoe, Victoria Beckham, Kate Hudson, Natalie Portman, Doutzen Kroes, Nina Garcia, Stella McCartney and Pink. Pickles anyone?

Speaking of models, check out Hollywood daughter Rumer Willis heating up the new Badgley Mischka advertising campaign.

And take a peek at Leighton Meester's new Missoni ads.