Selena Gomez Tours Paris in Pajamas and Heels

Selena Gomez rocked a surprising new fashion trend in Paris on Saturday.

Sporting straight hair and ruby red lipstick, the "Same Old Love" singer stepped out in navy blue pajamas and red high heels to promote her upcoming album, Revival, at a recording studio in the French capital.

WATCH: Selena Gomez Praises Ex-Boyfriend Justin Bieber's Comeback

Aside from this interesting casual-meets-glam look, Gomez's fashion game has been on point lately.

Dressed in a gorgeous white flowy wrap dress with a gold-studded belt, Gomez looked like she was reliving her royal Monte Carlo days when she stepped out Saturday evening. Gomez played the lead role of Grace, a young girl who is mistaken as a British heiress, in the 2012 film about three best friends vacationing and having the time of their lives in Paris.

Before jetting to France, the former Disney star was promoting her second solo album, which drops Oct. 9, in London. She took to Instagram to share a photo in another fashionable outfit, a custom Atea Oceanie slip dress, which she wore to an interview on the Alan Carr: Chatty Man talk show. The outfit is similar to the look Aniston rocked at the 2002 Emmy Awards -- and Gomez was pretty stoked about that.

"I won't post a lot of pics like this but I have to say this was one of my favorites! Made me feel like Jennifer Aniston. LOVE YOU @ateaoceanie," the 23-year-old singer-actress wrote.

This isn't the first time Gomez has gushed about the 46-year-old former Friends star.

"She's amazing," Gomez said during a radio interview with KTU's Carolina Bermudez in June. "We met through my [old] management … so it was kind of like a friendly meeting and instantly she's, like, inviting me to her house. She has a pizza oven. Like, we've made pizzas at her house. She's very cool and very sweet. She kind of gives me a lot of, like, maternal advice."

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While on the U.K. talk show, Carr offered Gomez a drink of choice, pouring each other a shot of Fireball Cinnamon Whisky to take together.

"I’m from Texas, so...." the singer said.

After filming, Gomez tweeted, "LOVE you @chattyman –drinks and fun."

Carr also took to Twitter, writing, "Anyone else for a glass of Fireball?" He also shared a series of pics with the Texas-born singer.

ET caught up with Gomez at New York Fashion Week in New York City, where she opened up about another one of her friends, Demi Lovato. Watch the video below to hear her talk about their rekindled friendship.

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