Rob Kardashian has reportedly been offered $500,000 to return to 'Keeping Up With The Kardashians'.

The reality TV star is rumoured to have lost 25lbs on a new fitness regime and his mother Kris Jenner is said to be so keen to have him back on the family's show that she has offered him the huge sum.

A source told RadarOnline.com: ''Watching what he is eating has made a huge difference, and Rob has quickly dropped 25 pounds.

''Kris has been so impressed with Rob's progress, she is offering him $500,000 to return to filming 'Keeping Up with the Kardashians'. The money wouldn't be coming directly from Kris, but from the production company.''

However, Rob - who has been maintaining a low profile in recent months - isn't sure if he wants to come back.

The insider added: ''He isn't ready to film 'KUWTK'. He doesn't know if he ever wants to return to the show. He is ready to branch out beyond the reality show.''

Meanwhile, Khloe Kardashian's best friend Malika Haqq - who briefly dated Rob - recently insisted that he is doing well.

She said: ''Rob's very smart, he's got a business degree. He's still very motivated and creating - and he's so entertaining!''