Celebrating all of the ladies that give so much of themselves to provide the best lives that they possibly can for their children, Hollywood's stars join all those around the world in expressing the extreme gratitude to all of the moms out there on this Mother's Day holiday.

Keeping things short and sweet, Justin Bieber took to Twitter this morning while posting a heartfelt message reading, "HAPPY MOTHER'S DAY!"

After spending the afternoon at various pool parties and cookouts, the stars at Coachella slowly but surely converged at the Empire Polo Club concert grounds in Indio, California on Saturday (April 14).

It was the hottest party in town, and the grand opening of The Marquee Nightclub at The Star in Sydney, Australia had quite the star-studded guest list.

Showing off her growing midsection, Vanessa Minnillo showed up for the shindig on the arm of her hunky husband Nick Lachey.