The House Ethics Committee on Wednesday night announced it has opened up an investigation into California Rep. Katie Hill, who was allegedly involved in a ‘throuple’ and later dated a top staff member.

“The Committee is aware of public allegations that Representative Katie Hill may have engaged in a sexual relationship with an individual on her congressional staff,” read a statement from the committee.

“The Committee… has begun an investigation and will gather additional information regarding the allegations.”

It was reported last week by the conservative news outlet RedState that the freshman lawmaker not only engaged in a long-term “throuple” with her now-estranged husband and a younger female campaign staffer — but was also romantically involved with her current legislative director, Graham Kelly.

Hill, in a Tuesday statement to Politico, denied she was involved with Kelly — which would violate House rules.

She said she was also being smeared amid the divorce battle — and placed part of the blame on her estranged husband, Kenny Heslep.

“The fact is I am going through a divorce from an abusive husband who seems determined to try to humiliate me,” she told the Beltway outlet.

“I am disgusted that my opponents would seek to exploit such a private matter for political gain. This coordinated effort to try to destroy me and people close to me is despicable and will not succeed,” she added.

“Intimate photos of me and another individual were published by Republican operatives on the internet without my consent,” continued Hill’s statement. “I have notified Capitol Hill police who are investigating the situation and potential legal violations of those who posted and distributed the photos, and therefore will have no further comment on the digital materials.”