Happy Birthday to Mariah and Fergie!

Two very special ladies are toasting their birthdays today: Mariah Carey and Fergie! The pop stars are turning 40 and 34, respectively...but that's not the only thing they've got in common. Mimi and Fergie both changed their lives in huge ways this past year by getting married to the men of their dreams—Nick Cannon and Josh Duhamel—and both are gearing up to release new albums later in '09. Mariah is just about finished recording her tweltfth studio album, and Fergie will release The E.N.D., her much-awaited album with The Black Eyed Peas, on June 9.

No doubt they'll also both celebrate their cumpleaños this weekend like the fabulous divas they are: in an exotic location surrounded by family, friends, and plenty of champagne. Cheers to that!