The alleged couple hit up Los Angeles' Cycle House together Wednesday, where they probably got their butts whooped in spin class! Khloé commemorated her tough workout by posing underneath the business' sign with Harden and two of the top instructors, Nichelle Hines and Aaron Hines.
"Post class pic with the newest members of the E! family. Welcome to family guys! Thanks for kicking my ass tonight!!! Catch @HollywoodCycle Tuesday nights at 10pm! @ahines83 @spingalnichelle @jharden13," she captioned the pic.
They may not be a confirmed couple, but when two people exercise together it definitely gives some weight to the rumors! The Keeping Up With the Kardashians star and Harden first sparked the summer romance idea in people's minds when they were spotted at the Encore Beach Club in Wynn Las Vegas together over Fourth of July weekend.
"They were at the beach club yesterday snacking on chicken fingers and fries, salads and fruit," a source told E! News. "Rick Fox and Jermaine Dupri joined them at their cabana."
In addition to hanging out with friends and sharing snacks, the E! star and NBA player also were caught getting close on the dance floor, only furthering the potential romance rumors. Still, a source maintained they were just there to have a good time.
"They were bouncing around to all their friends honestly," a source shared with E! News. "They sat next to each other and talked for a bit but they were more there to have fun it seemed!"
The insider added, "It was all just a fun party and she looked fabulous."
Based on Khloé's intense workout regimens and her passion for spin at Cycle House, which seems to be incredibly intense, it's not a surprise to see that she's looking so fantastic! She even had brother Rob Kardashian snap a pic of her enviable booty for Instagram LOL.
Tune-in to a brand new Hollywood Cycle this Tuesday at 10 after Total Divas, only on E!