Pesky paternity rumors aren't keeping this mother/daughter duo down! Despite rumors that Lionel Richie is Khloe Kardashian's biological father, the tallest Kardashian and mama Kris Jenner went about their day on Friday as usual. We guess these two are just trying to act better than they feel!

Khloe went about her day, wearing some sexy spandex for a spin at the gym. Meanwhile, donning a black minidress and ankle boots, Kris was busy medicating with a little bit of retail therapy. Looks like these two are up to their usual tricks!

Earlier this week outlets reported that Kris had had a fling with the "Easy Like Sunday Morning" singer in the '80s, when she was still married to Robert Kardashian.

A source told In Touch this week, "They had a sexual affair - he bragged about it. … He said he was on the outs with his wife at the time."

After Khloe's three-hour gym sesh (that's right three hours … clearly she had a lot of tension to work out), our photogs asked the 30-year-old about the swirling rumors. The reality star just shrugged off the questions … But of course, insiders (and people with eyes) were quick to notice, that Khloe looks strikingly similar to Lionel's 16-year-old daughter Sofia.

At this point, really anybody could be Khloe's real dad -- well except for Robert Kardashian!