Rapper Big Sean has been working out like crazy lately. And according to one of the rapper's friends, he's also been taking STEROIDS.

A person close to the rapper who calls Big Sean a "friend" told MTO News that he believes that the 5 foot 6 rapper has been using "juice" to bulk up.

The friend explained, "[Big Sean] has always been into fitness. But now that he's taking juice [performance enhancing drugs] he's gotten huge."

And while we cannot confirm whether Big Sean is on steroids, we can certainly say that he's gained a lot of muscle FAST.

Here's what Big Sean used to look like:

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And here's what he looks like now:

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Recently, Big Sean enthusiastically announced his return with a new single called “Overtime,” which comes from his forthcoming album Don Life. During a FaceTime interview with Beats 1, Sean Don opened up about the album making process and described his latest material as OG Sean.

“I just been returning to my roots, bro,” he told Zane Lowe. “I’ve just been getting back to having fun with it. At one point, I felt like it might have started to become like a burden, or like work, but now it’s just fun. So this is just me having fun bro, expressing myself. It was a time well spent.

“I never really knew how important it was to take some time for myself and get myself right. And it takes a while so it can take … That’s something you can’t really put on a time schedule.”

Bis Sean is a rapper that was signed with Kanye West's GOOD Music in 2007, Def Jam Recordings in 2008 and Roc Nation in 2014. 

After releasing a number of mixtapes, Sean released his debut studio album, Finally Famous, in 2011, which peaked at #3 on The US Billboard 200, and went Platinum. 

He released his second studio album, Hall of Fame, in 2013, that peaked at #3 on The Billboard 200, and went Gold. Sean's next albums, Dark Sky Paradise (2015) and I Decided (2017), both peaked atop the US Billboard 200 charts and received Platinum status.