Sibling rivalry is as old as family itself, and you’d think it would be even more common in famous families, but when it comes to Jessica and Ashlee Simpson that’s definitely not the case.

Jessica has been a big supporter and fan of her sister over the years, and the most recent example is Jess’ repeated viewings of Ashlee’s performance in the long-running New York City staging of Chicago.

She’s been in the audience to applaud her sister five times since the show opened on Nov. 30.

On the night of the premiere, Jessica twittered her approval of Ashlee’s performance as the musical’s leading lady:

“Roxie was all Heart! Watching her up on that grandiose stage made me the proudest sister in the world. I love ya honey, I love ya!. Grrrrrrr”

The following night Jessica again took to her Twitter page to voice her sisterly pride:

“Night #2 (: I’m so proud!! Butterflies all over again!!!”

It seems Jessica’s cheerleading for her sibling hasn’t diminished in light of her own ups and downs, which People.com provides visual evidence of in a photo montage.

- Source: ivillage.com