Khloe Kardashian and Lamar Odom's alleged cheating scandal is reportedly taking a toll on the Keeping Up with the Kardashians star despite her well-maintained tough appearance.

Kardashian was spotted leaving a gym on Thursday looking distressed, and she wasn't wearing her wedding rings when she is known to wear them regularly, People reported.

"She didn't smile at all and seemed miserable," a source told People. "She seemed like she had a lot on her mind."

Recent headlines have claimed the couple has been living apart and Kardashian has had enough with alleged accounts of Odom's infidelity. According to reports, Odom has cheated on Kardashian numerous times during their marriage -- one of which was an alleged extensive affair that lasted for about a year.

The couple reportedly hasn't been seen together out in public since June 2 and they've declined comment on reports they're heading to divorce court.

Speculation Kardashian and Odom's marriage is on the rocks is also a result of Odom, 32, being spotted at hotels nearby his shared home with Kardashian, 29. However, a source told People the pair stays at separate locations when Kardashian is taping her family's reality show and she continues to be "very loyal" to her husband.

"It's difficult for Khloe that people are questioning her marriage, but she's strong and Lamar is her world," another source added.