Kelly Rowland spent her 33rd birthday partying with Beyonce like it was 2001.

The "Single Ladies" crooner and former "The X Factor" judge took to her tumblr account Thursday to share pictures from her former bandmate's birthday party.

One of the images shows the two singers cracking up as Beyonce gives Rowland a piggyback ride. Another pic finds Rowland kissing her gold birthday cake. As evidence by the photos, Beyonce's sister, Solange, was also in attendance at the gathering.

Beyonce later shared one of the pics on her Instagram account.

The birthday girl is currently engaged to manager Tim Witherspoon. She released her fourth solo album, Talk a Good Game, in June of 2013.