Tom Cruise is giving Zac Efron career advice. The two actors ? who recently became friends after realising they are both motorcycle enthusiasts ? speak regularly, with Hollywood legend Tom becoming the younger star's "professional and personal guru".

A source said: "Tom and Zac clicked the minute they met. Now, when Zac gets a script to consider, his first call is to Tom. Tom warned Zac to diversify and not get pigeon-holed in one type of role."

As well as giving the High School Musical actor professional advice, the Knight and Day star ? who is married to Katie Holmes ? advises his young friend of personal matters too.

The source explained to National Enquirer magazine: "Zac is extremely shrewd, but he considers Tom a personal and professional guru."

"Tom also warned Zac how to conduct himself in public."

The pair are enjoying their bonding sessions so much, they are even considering working on a new movie together.

The source added: "They've even talked about teaming up on a film together ? the way Tom did with Paul Newman on the 1986 film The Colour of Money."