by Zach Seemayer 11:15 PM PDT, March 19, 2017

Britney Spears and Sam Asghari are growing closer all the time.

On Thursday, the pop icon and her boyfriend were all smiles as they came out to support Asghari's sister, Fay Asghari, at Los Angeles Fashion Week, where she walked the runway.

WATCH: Britney Spears Shares Spicy Snap of Beau Sam Asghari Shirtless

Spears, who looked stunning a skin-tight black minidress, and her dancer beau, who rocked a navy blue button-down shirt and white jeans, sat side-by-side in the front row at designer Michael Costello's Art Hearts show at the Beverly Hilton hotel.

Photo: Getty Images

Asghari couldn't have been more thrilled to bring Spears to his sister's big night, and documented her runway debut on Instagram.

"My little big sister doing her first show," Ashghari excitedly captioned the video.

My little big sister doing her first show @fayasghari

A post shared by Sam Asghari (@samasghari) on Mar 16, 2017 at 11:43pm PDT

WATCH: Britney Spears Celebrates 'Baby' Sam Asghari's 23rd Birthday With Sweet Couples Pic

Later, Costello took to Instagram to thank the cute couple for coming out and sitting in the front row at his runway show.

"You guys are such sweethearts," the fashion designer captioned a photo of the pair. "We love that you came out to support our show."

Thank you Britney Spears and Sam Asgari for sitting front row at the @sirstello fashion show . @britneyspears @samasghari you guys are such sweethearts . We love that you came out to support our show so so so sorry you had to see that previous show that almost made you leave #wilfredotried lol #oops

A post shared by Michael Costello (@michaelcostello) on Mar 17, 2017 at 12:05am PDT

Earlier this month, Spears celebrated Asghari's 23rd birthday with a super cute snapshot from their hike in the Los Angeles hills, which she captioned, "My baby's birthday."

My baby's birthday 💜 @samasghari

A post shared by Britney Spears (@britneyspears) on Mar 3, 2017 at 5:36pm PST

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Spears met Asghari when he starred in her "Slumber Party" music video, first sparking romance rumors last November. Since then, the pair have spent a lot of time hanging out and showing up on each other's social media. Check out the video below for more on their burgeoning romance.

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