Could Cardi B be flirting with Keeping Up With the Kardashians star Rob Kardashian on Instagram? It sure looked that way to some!

According to a new report, the rapper was caught reacting excitedly to a photo posted on Instagram that claimed to feature before-and-after photos of Kardashian's alleged weight loss. While the photos weren't actually current, Cardi B's response certainly caught the attention of many.

“Yaaaasss Rob!!!!!!” she enthusiastically wrote in the comments section of the Instagram post.

In both of the photos of Kardashian, which were shared by a private account on Instagram, the reality star and single dad was seen sporting a black T-shirt and carrying a water bottle.

After catching wind of the rapper's reply, Hollywood Life shared a screenshot of the message and noted that Cardi B's comment was made about old photos of Kardashian. That said, the outlet claimed that Kardashian has been attempting to lose weight in recent weeks. While he still has quite a long way to go when it comes to his goal weight, he's reportedly lost 15 pounds.

Earlier this month, a source told the outlet that Kardashian's older sister, Khloe, was helping him lose weight and pushing him to drop an additional 20 to his 10.

“Khloe [Kardashian] is making it her mission to get Rob healthy again,” an insider told Hollywood Life. “She has a couple of months left before her baby arrives and her big priority is getting Rob back on track.”

As fans of the Kardashian-Jenner family likely know, Khloe is currently expecting her first child with boyfriend Tristan Thompson. However, her pregnancy hasn't stopped her from staying fit and in shape and she frequently shares photos and videos of herself doing pregnancy-safe workouts online.

“He’s grateful for her help and so far seems very motivated. He says he wants to get back to being himself again, he misses life," the insider said. "Rob’s actually making some progress, he hasn’t lost a ton of weight yet but he’s down about 15 pounds so it’s a good start."

As the insider explained, Khloe has challenged Kardashian to lose an additional 20 pounds by the time she welcomes her first child later this year.

Keeping Up With the Kardashians airs Sunday nights at 9 p.m. on the E! Network.