Did Tristan Thompson step out on Khloé Kardashian once again?

Instagram model Sydney Chase claimed in a new interview that she hooked up with the Boston Celtics player, 30, in January of this year.

"It was a peek-a-boo d–k, but, baby, it was good," Chase said on the "No Jumper" podcast when asked about Thompson’s "uncut" penis.

"He told me he was not in a relationship anymore, so I said OK," she alleged. "We talked, we hung out multiple times, we went out together, everything."

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A woman has come forward claiming she got intimate with Tristan Thompson earlier this year.

A woman has come forward claiming she got intimate with Tristan Thompson earlier this year. (Jerritt Clark/Getty Images for Remy Martin)

Chase claimed she flat-out asked the NBA star — who reconciled his relationship with Kardashian, 36, last summer — "Are you single?" and he allegedly responded, "Yes."

"It happened, and then I found out he was not single, and I cut him off," she said.

Kardashian’s rep didn’t comment. A rep for Thompson couldn’t be reached for comment.

It wouldn’t be the first time Thompson has cheated on the "Keeping Up With the Kardashians" star with an Instagram model. As Page Six exclusively reported in 2018, he had a steamy night with Lani Blair just days before Kardashian was due to give birth to their daughter, True.

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The baller then got involved in another cheating scandal with Kylie Jenner’s now-former best friend, Jordyn Woods, in 2019. Kardashian first blamed Woods, 23, for the hookup, but after facing backlash, the Good American co-founder turned her wrath on Thompson.

"Jordyn is not to be blamed for the breakup of my family. This was Tristan’s fault," she said in one of several tweets.

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In another post, Kardashian admitted that she "said things I shouldn’t have" as the scandal continued to unfold.

"This has been an awful week & I know everyone is sick of hearing about it all (as am I)," she wrote at the time. "I’m a rollercoaster of emotions & have said things I shouldn’t have. Honestly, Tristan cheating on me & humiliating me, wasn’t such a shock as the first time."

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The on-again, off-again couple officially got back together after quarantining together last year and have been debating using a surrogate to welcome a second child.