Why does this not surprise us?!

Donald Trump Jr. had a yearlong affair with Aubrey O'Day when she appeared as a contestant on Celebrity Apprentice in 2011, multiple outlets report.

"Things started up with Aubrey and Don Jr. toward the end of the taping. When it started, they were very serious all of a sudden. He told her it was over with his wife, that they were separated and he didn’t love her — all of that stuff … Aubrey fell for him hard. She thought they were going to be together for real," a source dished to Us Weekly.

Donald Trump's son and his wife Vanessa had three kids at the time, and after Vanessa found emails between her husband and O'Day, he called it off and she forgave him for cheating.

This secret almost got out way before now, too!

The Danity Kane singer cryptically tweeted about having some damning info on the Trump clan after Donald won the 2016 election.

"I’m embarrassed to be an American. My story I didn’t tell is worth millions now 😉 … this doesn’t hurt me, it hurts America. I’m heartbroken. Every beautiful piece of progression that our country could have moved toward is now gone,” she tweeted. “You can be a lying, abusive piece of trash that is personally and publicly racist, sexist & homophobic and run our country. I don’t feel there is any value to being a smart, ambitious successful woman anymore. You get nowhere. This country is a joke," O'Day wrote.

Infidelity seems to run in the family!