Kourtney Kardashian straddles boyfriend Travis Barker while making out

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Kourtney Kardashian and boyfriend Travis Barker‘s PDA train is going full-steam ahead.

On Thursday, the “Keeping Up with the Kardashians” star, 42, posted a pair of sexy snaps to Instagram, in which she straddled the Blink-182 drummer, 45, during a makeout session at a recording studio.

Captioning the images with a series of emojis, including the “fire” animation and a pair of hearts, the internet had loads to say about Kardashian’s steamy shots — as did Barker himself.

Barker, who started dating Kardashian in January, shared the same photos on his Instagram Story, showing the Poosh founder wearing denim cutoffs, a white tank top and a black bra.

Since making their romance Instagram-official in February, Kardashian and Barker have not shied away from public displays of affection. In April, Kardashian shared a photo of herself straddling Barker while wearing a thong-style bikini.

“Just Like Heaven,” she captioned the post at the time, referencing a song by The Cure.

Unsurprisingly, the chemistry between Kardashian and Barker has been described as “hot,” according to body-language pro Blanca Cobb.

“Kourtney and Travis are connected from their lips to their hips,” expert Cobb told Cosmopolitan in response to the couple’s PDA-filled photo.

“They’re all about a physical connection with Kourtney’s lips locked onto his and her bum snuggled into his hands. Let’s put it this way: The heat is on!” she later added.

Kardashian, who appeared in Thursday’s “Keeping Up with the Kardashians” reunion special, previously dated model Younes Bendjima and Scott Disick, with whom she shares sons Mason, 11, and Reign, 6, and daughter Penelope, 8.

Barker, meanwhile, was previously married to Melissa Kennedy from 2001 to 2002 and Shanna Moakler from 2004 to 2008.

Moakler, who has been critical of Barker and Kardashian’s burgeoning romance, has two kids with her ex: son Landon, 17, and daughter Alabama, 15.