Catelynn Lowell is BFFs With WHAT Famous Singer?!

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If you watch Teen Mom: OG online, you know that this season hasn't been an easy one for Catelynn Lowell.

We watched as Catelynn battled depression and eventually sought help at an in-patient treatment facility in Arizona.

But it's always darkest before the dawn, as they say, and in the wake of her recent struggles, Catelynn seems to be doing better than ever - and as a bonus, she recently befriended a bonafide pop icon:

TMZ caught up with Catelynn and Tyler Baltierra at LAX recently, and the fan favorites shared an interesting story about their latest celebrity run-in.

It seems that Aussie pop icon Sia is a big fan of Teen Mom and Catelynn in particular.

Sia recently reached out to Sia on social media to invite her to her concert in LA:

Catelynn Lowell at Jersey Shore Benefit

"She wrote me on Twitter. We have a lot of the same mental illness issues and stuff," Lowell says.

"She reached out to me and she said she was a huge fan of me, so she invited me to come to her concert."

Asked if the two of them hung out after the show Catelynn excitedly replied, "We did!" but sadly, she didn't go into any detail.

"I was absolutely shocked. Like, 'Why is she writing me? This makes no sense!'"

Sia arrives at BBC Radio 2 studios

Fortunately, Catelynn's confusion didn't keep her from accepting the A-list invitation.

Naturally, the TMZ cameraman quickly transitioned to the topic of Catelynn's marriage, which has been put through its paces in recent months:

"We're doing great," Lowell replied with a smile.

Tyler Baltierra Catelynn Lowell Novalee Hike Pic

Asked how long she plans to continue with the show that made her famous, Catleynn confirmed that she's signed on for at least one more season, but she was unwilling to commit to anything beyond that.

"I feel like it's always gonna be a part of my life," Lowell replied, vaguely.

And as long as the ratings juggernaut keeps pulling in the viewers, we're sure MTV will do whatever it takes to keep Catelynn and Tyler on board.

Watch Teen Mom: OG online to relive the Baltierra's turbulent year.

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Catelynn Lowell Biography

Catelynn Picture
Catelynn Lowell is an original cast member on Teen Mom. She and her fiance, Tyler Baltierra, gave up their baby in 2009 for adoption.... More »
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Catelynn Lowell