Brad Pitt's grandmother is desperate for him to get in touch.

The 'Moneyball' actor - who raises six children with his partner Angelina Jolie - hasn't seen or corresponded with 89-year-old Betty Russell for some time, and his family are unsure why he has stopped contacting everyone outside of his immediate family.

In an interview with The Sun newspaper, Brad's great-aunt Mary Ann Lenier said: ''Betty misses him. He doesn't write, he doesn't seem to stay in contact with her.

''I'm sure he's busy but I don't know why he doesn't stay in contact with his grandmother. He used to send her flowers every month and call her once in a while.

''She used to hear from him a lot but not any more. I know he stays in contact with his mother and father. They even go and visit him and Angelina when they're on film sets in different places.

''Betty's daughter Betty visits her every day and brings her magazine articles about Brad. I'm sure she misses him.''

Betty turns 90 this year and Mary Ann would love it if Brad - who last returned to his hometown of Springfield, Missouri, when Angelina was pregnant with their twins Knox and Vivienne, now three - made a special visit to see her.

She added she said: ''She'll be 90 on April 25. Her daughter might give her a party.''