Kylie Jenner and Tyga Split, Kylie Ditches His 26th Birthday Party

It's over between Kylie Jenner and Tyga.

It's over between Kylie Jenner and Tyga.

The 18-year-old Keeping Up With the Kardashians star has split from her 26-year-old rapper boyfriend, a source close to Kylie confirms to ET.

The "Rack City" rapper celebrated his 26th birthday on Thursday night at The Nice Guy club in West Hollywood, California, but Kylie was nowhere to be seen. Tyga also didn't appear to be in the greatest mood when he was snapped at the Hollywood hot spot or later, at 1 OAK night club, where he was clad in a matching green ensemble.

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WATCH: Kylie Jenner Reveals She's Broken Up With Tyga in the Past

TMZ reports that the couple split on Thursday, with sources telling the outlet that "it's something Tyga did." However, TMZ cites those close to the rapper as saying he's the one who ended it, citing "pressure from the Kardashians."

"They are on a break," E! News quotes another insider. "They were just a week or so ago talking about 'ever after' and things got messy this past week. Kylie wants time to just be by herself and do her. Tyga is not giving up as that's his one and only lady."

Tyga is "devastated" and denies "doing anything" at all, the outlet also reports.

Kylie was spotted arriving at LAX on Thursday with her sister, Kendall Jenner, so we do know she was in Los Angeles during Tyga's birthday festivities.

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Perhaps most telling is Kylie didn't wish Tyga a happy birthday on social media and neither did any of the Kardashians -- something the family always seems to do for those close to them. Kourtney Kardashian wished her mother Kris Jenner's boyfriend, Corey Gamble, a happy 35th birthday earlier this month.

Kendall did have time to post this NSFW Instagram on Thursday of a woman bending down and flicking off the camera, perhaps alluding to her current mood.

Interestingly enough, things seemed just fine between Kylie and Tyga just last Thursday, when they went to The Nice Guy together. Tyga, in particular, had a big smile on his face.

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"Everyone who knows me, knows I've always been a relationship girl," Kylie wrote in a post on her app and website on Monday. "I've never believed in the idea of casual dating or being with two people at once. I feel like I only have room for one person in my heart and I want to give whoever I'm with all the attention they deserve."

WATCH: Did Tyga Just Refer to Kylie Jenner as His Fiancee?!

Last night's birthday celebration was a far cry from Kylie's 18th birthday celebration in August, when Tyga made his presence well-known. The rapper gifted the teenager with a white Ferrari 482 Italia, worth $320,000.

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