NEW YORK _ Donald Trump Jr.'s marriage was reportedly rocky long before his wife, Vanessa, filed for divorce.
The president's first-born son had an affair with former Danity Kane singer Aubrey O'Day after meeting on the set of "Celebrity Apprentice" in 2011, according to Us Weekly and Perez Hilton.
"When it started, they were very serious all of a sudden," a source close to O'Day told Us Weekly.
"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."
Trump Jr. and wife Vanessa married in 2005 and have five children together. Their son Spencer was born about a year after the alleged affair began.
Trump Jr. and O'Day continued the alleged affair until March 2012, when Vanessa found emails between the two, according to Us Weekly.
Trump Jr. told the now-34-year-old singer that he was splitting from his wife, Perez Hilton reported.
"Don Jr. was very aggressive, pursuing her, telling her he loved her and that he wanted to be with her," a source told the gossip site.
O'Day, who has not commented on the reports and did not return the Daily News' request for comment, released a song in 2013 titled "DJT."
"You can say it was all a ... fairytale or you can say it was real, but I need to know and you know," read the lyrics for the song off her "Between Two Evils" EP.
"Whatever the truth is defines the reality of you and I forever, and I need to be able to define that before I can walk away."
The reports of the alleged affair come just days after Vanessa Trump filed for divorce after more than a decade of marriage.
"After 12 years of marriage, we have decided to go our separate ways. We will always have tremendous respect for each other and our families," the couple said in a joint statement. "We have five beautiful children together and they remain our top priority. We ask for your privacy during this time."
A representative for Trump Jr. did not immediately return a request for comment.
