Russell Brand has invited Charlie Sheen to join his yoga class.

The 37-year-old comic - who has previously battled addictions to DRUGS - has befriended the 'Anger Management' actor, but pals are said to be worried about their Bond because they don't want the British star to be led astray.

A source said: ''Russell and Charlie have been spending an increased amount of time together as they've been named by [TV network] FX as the stars for their summer schedule so have done a lot of promotional work together.

''Russell has invited Charlie to join him at his yoga classes.

''But Hollywood is a small place and everyone is worried Charlie might lead Russell astray.

''Russell is a strong guy, he won't just fall off the wagon, but he's single after his split from Katy Perry and on the look-out for women - and Charlie's legendary parties are always packed full of beautiful women.''

Despite warnings from his friends, Russell is always happy to hang out with Charlie - who was sacked from sitcom 'Two and a Half Men' last year because of his erratic behaviour and wild partying - as he knows what it is like to go ''off the rails''.

The source added to the Daily Star newspaper: ''Russell's friends are panicking as Charlie keeps calling him, chasing him to meet up.

''Russell is too kind to say no, he thinks Charlie just needs a friend, someone who'll look out for him. Russell was once in the same situation, off the rails and lonely.

''But Charlie is a Notorious bad boy and will definitely be a bad influence on him.''