In the earlier seasons of Keeping Up With The Kardashians, the only boy born amid a bevy of girls was a fan favourite for his goody demeanour and all-around silly antics.

But Rob Kardashian took a hit with his mental health and his physical changes caused many confidence issues, causing the reality star to take a hiatus from the small screen.

Rob Kardashian is showing off his glow up!

The high-profile family is celebrating the good news! Rob Kardashian is sharing his new commitment to his health, both mentally and physically.

Robert Kardashian attends the Premiere Of THQ's "Saints Row: The Third".

The reality star took a break from the small screen following depressive episodes and weight gain, and, after Rob & Chyna got cancelled, hasn't appeared on any other reality TV series.

Now, a previously shy and recluse social media user, Rob is posting again on his social media platforms, and an inside source says the family is proud of their brother!

"Everyone is just thrilled about how well Rob is doing," the source said.

This week, Rob posted photos of himself celebrating his littlest sister, Kylie Jenner, on her 23rd birthday, something he rarely does.

"[Rob] had a lot of work to do when it comes to his health and he continues to be very committed," they said.

"To have him join Kylie's birthday trip was such a treat for the whole family. They love having him around," the source added.

In the past, Rob has chosen not to go on any family trips, often cancelling last minute, much to the disappointment of his sisters, specifically Khloé Kardashian, whom Rob is closest to.

"Rob is going to be on the show more," Khloé said.

"We're filming more within our homes, and he is right there with us. I'm excited for everyone to see that. He's such a good person and I'm just happy he's coming back around on camera a little bit more," she added.

Keeping Up With The Kardashians is back on the air this September.