More details have emerged about Kaitlyn Bristowe having sex with one of her suitors in a hotel before her round of fantasy-suite dates and how that "mistake" affected her relationship with one of Season 11's frontrunners.

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[Spoiler Warning: Please stop reading now if you don't want to know whom Kaitlyn Bristowe has sex with.]

During last week's episode, Bristowe admitted to Shawn Booth, 28, she was falling in love with him after he confessed the same thing. But in Monday night's June 22 broadcast, The Bachelorette star reportedly sleeps with Nick Viall on their date in Dublin.

According to a show insider, Bristowe invited the 34-year-old software salesman inside her hotel room at the end of their one-on-one date, Us Weekly reported.

The couple allegedly still had their microphones on when entering the room and shutting the door in producers' faces.

"Kaitlyn says, 'Don't come knocking,'" revealed the show insider. "Nick whispers that he wants to know all of her."

As recorded and shown in promo clips, moans are then heard from the bedroom.

The morning after, Bristowe "doesn't regret it," the insider said. "But she feels guilty about hurting the guys."

Bristowe, 29, later gives her group-date rose to Booth. But Booth reportedly has something to confront her about.

"She thinks he found out she slept with Nick," another source told Us.

The source insisted Booth doesn't learn about Bristowe's sexual encounter with Viall until weeks after it happens and he was devastated about it.

"He hates sharing Kaitlyn," noted the source.

Viall had finished as the runner-up on Andi Dorfman's tenth season of The Bachelorette and later shockingly revealed on After the Final Rose they had made love. Viall was heavily scrutinized for kissing and telling, as many fans thought it was a disrespectful thing to do to Dorfman.

Bristowe allowed Viall to compete for her heart even though he attempted to join the reality dating competition about four weeks in. Bristowe seemed immediately smitten with him although she had been developing strong relationships with other men already -- like Booth, for example.
About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.