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!"

Spending the day celebrating some Easter festivities, Pink and her hubby, Carey Hart, took their adorable daughter Willow to see the Easter bunny at The Malibu Easter Fair on Saturday (April 7).

The "So What" singer looked ready for spring wearing a jean jacket, summer dress and fedora hat while her motorcycle racing beau opted for a more casual look in a t-shirt, black shorts and sneakers.

Giving her friend a special birthday treat, Pink and her baby girl wished Ellen DeGeneres a very Happy Birthday in a video message.

The daytime TV talk show host celebrated her 54th birthday on Thursday (January 26) and a plethora of celebrities were tapped to send her some birthday love.