Maddie Ziegler of "Dance Moms" celebrated her 15th birthday last Sept. 30 and her co-stars took to Instagram to share heartfelt greetings for her.

Kalani Hilliker, who just turned 17 a week ago, said in her post said that she was lucky to have an angel in her life. Hilliker got the same Instagram photo floods on her birthday. In Nia Sioux's post, Ziegler's co-star could not believe time flew very fast for the both of them as she remembered that they were just eight years old when they first met. She also posted an old photo of her and Ziegler pouting lips.

Kendall Vertes also could not contain her love for her friend as she wrote, "You have accomplished so much and you are only 15...WHATTTTTT! I hope you have the best day ever. So happy I get to call you my best friend."

Ziegler also posted a photo of her and boyfriend Jack Kelly, who she has been dating for 10 months. For their first year anniversary, Ziegler is planning to go to Australia with her boyfriend. She also posted another photo where she wore a red dress with polka dots with a caption that read "15."

Aside from starring in the reality dance show "Dance Moms" and appearing in Sia's music videos, Ziegler starred in the film "The Book of Henry." She also made an appearance in "Pretty Little Liars" where she performed a very chilling dance in front of Spencer Hastings (Troian Bellsario). "The Maddie Dairies: A Memoir," a New York Times best-seller was also written by the teen achiever. Ziegler has also launched her own clothing line

The 15-year-old dancing queen told Entertainment Weekly that she is also getting a driver's permit and added that it was her biggest goal. Ziegler also confirmed the top-secret project she will be working on with Kate Hudson and Sia.