"Teen Mom OG" star Catelynn Lowell has a brand new celebrity friend. The MTV reality star was personally invited to a concert by singer Sia. Sia, who extended a personal invitation to Catelynn via Twitter revealed that she was a big fan of the show and that she and Catelynn struggle with a lot of the same mental health issues. Catelynn, who has been dealing with depression and anxiety has made her story public via the reality series, and Sia took notice. Lowell recently revealed to TMZ that Sia invited her to come watch her concert in Detroit and Lowell couldn't refuse.

Catelynn Lowell's new famous friend

According to the report, Catelynn Lowell was completely stunned when she found out that Sia personally wanted to meet up with her. "She wrote me on Twitter and we have a lot of the same mental illness issues, so she reached out to me and invited me to come to her concert," the "Teen Mom OG" star gushed. Catelynn called the situation a "big deal" and revealed that she even got to hang out with Sia. "I was absolutely shocked," Cate said with a smile on her face.

'Teen Mom' star shocked by Sia's invitation

Of course, this isn't the first time that Sia has gone totally fangirl over a Reality TV star. In the past she gave "Survivor" contestant Tai Trang a huge donation of $100,000 after he refused to kill a chicken on the show for survival.

Half of the money given to Trang by Sia was dedicated to go to Tai Trang's favorite charities, while the other $50,000 he got to keep for himself.

Sia's dark past revealed

While Catelynn Lowell didn't get any money to give out to charity, she did have a priceless time with the singer. The "Teen Mom OG" star had a sweet message for Sia after attending the concert with her.

"Thank you so much. I love you. You rock!" she said on camera while blowing a kiss. It's easy to see that Catelynn and Sia would bond over their depression issues. The singer has made no secret that she hides her face as a way to stay as private as possible while living in the public eye. She has also admitted to being an alcoholic and drug user before finally getting sober.