Lamar Odom nearly had a run-in with estranged wife Khloé Kardashian and her new beau French Montana on Tuesday, May 13 at West Hollywood hotspot Penthouse, and now, a source tells Us Weekly it wasn't accidental the exes were in the same place, at the same time.

PHOTOS: Khloé and Lamar's romance

"It was actually Khloé who invited Lamar to the club because she knew the E! cameras were going to be there," a source close to Odom tells Us exclusively.

The reality star and Montana, who was at the club as a special guest, were joined by Kim Kardashian and friend Jonathan Cheban.

PHOTOS: Kardashian family album

"She totally set him up and he is livid," the source says, adding, "she wanted it to look like he was stalking her on camera."

The Knicks player did know though that the "Ain't Worried About Nothin" rapper would be there. "He knew French was going to be there," the source continues, "but Khloe asked him to come and he went. He feels like an idiot for trusting her."

PHOTOS: Khloé's body evolution

However, the 36-year-old "had no idea the E! cameras were going to be there."

Following the near run-in, Khloé took to her Twitter and tweeted the next day the cryptic message: "Still hurts... Maybe it always will."

PHOTOS: Khloé's wedding

Khloé filed for divorce from the basketball player after four years of marriage back in December 2013. She first stepped out publicly with Montana just last month.