If the Kardashian sisters are omnipresent, their brother Robert is the opposite. The media hasn't caught a glimpse of him ever since he put on 100 pounds in one year.

If you've watched the E! reality TV series "Keeping up with the Kardashians", you would know that Robert or Rob as he is called on the show, missed the Kimye wedding.

And if rumours are to be believed, the Arthur George sock designer is making his comeback on season 10, episode 14 of "Keeping up with the Kardashians."

A source close to Rob said that he has lost 15 pounds and is following a healthy diet. He is also working out with his pregnant sister, Kim.

The last of the Kardashians looked visibly thinner in an August 21 photo he posted on Instagram.

According to the insider, Rob has started filming scenes for season 11. Khloe Kardashian's younger brother would have to make his appearance on the show if he wants to uphold his end of the $2 million a year contract with E! according to US Weekly.

Although the publication reports that Rob would be seen in the latest season of KUWTK, he hasn't appeared in any of the promo clips so far.

Hollywood Life also reported that Kim Kardashian's daughter, North West will appear more often in season 11. The three sisters also travel to Armenia, but whether or not they find their roots remains to be seen.

In another promo for rthe rest of season 10, Khloe reveals that she still cares for ex-husband Lamar and is seen texting him. 

You can watch the trailer for "Keeping up with the Kardashians" season 10 here: