Kourtney Kardashian Leaves Very Little to The Imagination in Racy Red Bikini

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kourtney kardashain/instagram

Kourtney Kardashian is bringing the heat in the winter.

The POOSH founder, 41, posted a racy photo of herself in a tiny red string bikini on Friday.

In two of the photos, she emerged from a pool. The final shot was a close up of her toned body as she modeled the Sommer Swim two-piece.

"A little fun in the sun," Kardashian captioned the post.

kourtney kardashain/instagram

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Her youngest sister Kylie Jenner commented, "🔥♥️."

Model Lily Aldridge wrote, "🔥🔥🔥🔥🔥.

Kardashian's best friend Simon Huck added, "Weekend starts now! 📈📈📈📈

The Keeping Up with the Kardashians alum's steamy pictures come amid a source telling PEOPLE she's been dating her longtime friend Travis Barker "for about a month or two."

kourtney kardashain/instagram

RELATED: Kourtney Kardashian Is Dating Travis Barker: Source

"He's liked her for a long time and she just got more open to the idea. He's a good guy and a really great dad," one source told PEOPLE recently. "Her family and friends all really like him. Their kids all get along too, which is sweet."

Kardashian and her ex Scott Disick co-parent their three kids: sons Mason, 11, and Reign, 6, as well as 8-year-old daughter Penelope. Kardashian and Disick, 37, ended their nine-year relationship in July 2015.

Meanwhile, Barker, 45, shares stepdaughter Atiana, 21, daughter Alabama, 15, and son Landon, 17, with his ex-wife, Shanna Moakler, whom he was married to from 2004-08.

RELATED VIDEO: Kourtney Kardashian Is Dating Travis Barker: Source

Kourtney Kardashian Is Dating Travis Barker: Source

"They've been friends for a long time but it's turned romantic," a source tells PEOPLE

"They are having fun. Kourtney's family likes Travis. He is a safe guy for Kourtney to date. They are taking it slow and it's not serious," says the second source.

A rep for Barker did not respond to PEOPLE's request for comment.