Rumer Willis turned 27 this past weekend, and it was likely the birthday wish that came from her three-year-old half sister that make her smile the most.

Mabel is Bruce Willis’s daughter with wife Emma Heming. Willis and Demi Moore are the parents of Rumer Willis, along with sisters Scout and Tallulah Willis.

Rumer shared a short video clip on her Instagram account that features little Mabel and her enthusiastic birthday message.

“Best Birthday Message Ever courtesy of my beautiful sister Mabel,” Rumer Willis captioned the post.

A video posted by Rumer Willis (@ruelarue) on Aug 17, 2015 at 11:18am PDT

Mabel Willis is positively adorable. It’s easy to see why her message was Rumer Willis’s favorite.

Rumer shared at least part of her birthday with sisters Tallulah and Scout Willis, too, and posted a photo of the three girls on Instagram.

“The perfect way to start my birthday….a moment of pure unfiltered joy with my beautiful sisters. I’m so thankful for them. There are the only a few people in the world that make me smile this big,” she captioned the shot–taken on a bed.

A photo posted by Rumer Willis (@ruelarue) on Aug 16, 2015 at 1:09am PDT

It certainly appears like the Dancing With the Stars winner had a wonderful birthday. Next it’s off to Broadway for Rumer Willis, where she’ll star as Roxie Hart in the musical Chicago.

Fans can check out Rumer Willis in her Broadway debut from September 14 through November 1.