Britney Spears' Birthday Dance With Sophia Grace And Rosie Is Cuter Than Puppies [Watch]

Pint-size 'Ellen' co-hosts link up with Brit for an early birthday party between rehearsals for her Las Vegas show.

Britney Spears got nothing short of a "massive, big surprise" from talk-show host Ellen's young pals, Sophia Grace and Rosie. The two cousins stopped by Spears' Las Vegas residency rehearsals for a segment on "The Ellen DeGeneres Show," and while there, they helped celebrate the singer's upcoming 32nd birthday.

In addition to learning some of Spears' choreography — and getting the chance to show off the moves alongside Brit! — they presented the pop star with balloons and cupcakes. Spears must have been impressed with the impromptu princess-themed party because she called it "spectacular."

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During the party, Spears revealed that her wish is "to have four vacations a year." Then the adorable sisters presented the "Perfume" singer with gifts, including a tiara with a mic attached, and a fluffy, purple tutu. "Now my show will be perfect," Spears told her "two new best friends."

Britney's actual birthday is on December 2, a day before she releases her new album, [article id="1717930"]Britney Jean.[/article] The studio record will be the singer's eighth and includes features from folks like T.I. and, as well as an appearance from her little sister, Jamie Lynn, on the track [article id="1717381"]"Chillin' With You."[/article] (Spears was recently snapped kissing a mystery fellow on the set of her new music video for [article id="1717769"]"Perfume,"[/article] a solo track.)

Weeks after the album hits retailers, she'll kick off her two-year Las Vegas residency, [article id="1714335"]"Piece of Me," at Planet Hollywood[/article] on December 27.