Ananova:

Ozzy Osbourne has had two smiley face tattoos etched on his kneecaps so he can talk to them when he's feeling lonely.

The rocker told US chat show host Conan O'Brien: "I hate being alone. I suffer from loneliness. So, I just got two little faces on my knees.

"When I'm p***ing people off they don't want to talk to me so I can always pretend they're alive and talk to them.

"My son (Jack) has just had it done - it's like a family tradition, an Osbourne family tradition."

The rocker also spoke about reports that Jack wants to become a fireman.

"Yeah, he comes up with these crazy ideas from time to time," before adding that he thought a fire fighter is a "fine thing" and that Jack would probably make a good fireman.

Ozzy also revealed that he keeps failing his driving test.

He said that on one occasion before he gave up drugs and alcohol, he passed out after doing a three-point turn.

Sometimes he would have to be taken home after doing a test "in a police van."

He said he has taken the test "about four or five times" in England, "but, I was so stoned and loaded that...(I failed), but I can drive great."