Well, tell us something we don’t know! Best friends Alli Simpson & Madison Pettis are best friends and they’ve got proof! Check out the duo in the video above, which is called “Best Friend Tag.” Alli’s birthday is also today and Madison tweeted this: “HAPPY 14TH BIRTHDAY to my best fwiend @TheAlliSimpson!! Love you!!! Xoxoxo” along with this photo:

Photo Credit: Madison Pettis's Instagram

So, what does Cody Simpson do before a show? We now know thanks to his younger sister Alli Simpson! During his warmup before his performance at the Atlantis Resort in the Bahamas, Alli recorded this secret video of Cody doing some vocal warmups. Check it out above.

Zendaya Coleman celebrates her 15th birthday on the beach with her family, close friends and cast mates! Attendees included: Davis Cleveland, China Anne McClain, Kenton Duty, Stefanie Scott, Alli Simpson, Madison Pettis, Blake Michael, Allisyn Ashley Arm and more!

Australian singer Cody Simpson and model sister Alli Simpson, showed off their best dance moves at their recent take over of RadioDisney! Check out the Simpson duo’s best dance moves in the video above.

Cody Simpson and Alli Simpson make their movie debut! The brother and sister duo team up in what seems to be Alli’s movie entitled “Brittany’s Nerd”: a mini movie, by Alli Simpson (actress). The movie also features Madison Pettis! Check it out above.

Be nice to the nerds, they could be your boss one day! It’s not what you look like on the outside, it always stays the same inside.

P.S. You also get a glimpse of Cody’s closet!