Bruce Willis is reportedly angry about pictures which appear to show Rihanna making a late night visit to Ashton Kutcher's house.
The 57-year-old 'Red' actor - who was married to Ashton's estranged wife Demi Moore for 13 years before their divorce in 2000 - apparently feels the 'Two and a Half Men' star shouldn't be moving on so publicly.
A source told the Daily Star newspaper: ''Bruce's been trying to phone Ashton to tell him to be more considerate towards ex-wife Demi, but Ashton's ignoring his calls.
''Bruce isn't happy about the Rihanna pictures and wants to chat to him man to man.''
Ashton and Demi split after six years of marriage in November following claims Ashton had been unfaithful. While he has already been linked to numerous women, including the 'S&M' hitmaker, Demi has spent time in rehab for reported addiction problems and an eating disorder.
The heartbroken actress - who has three daughters from her marriage to Bruce - is now said to be ''stalling'' the divorce by refusing the sign the papers.
A source told Grazia magazine: Demi is stalling as she's so hurt and angry with Ashton right now. She keeps getting bits of information from mutual friends, which is making things even worse. She said that when she first filed for divorce, they both made a pact that they would be upfront with each other when their time came to move on, so Ashton's behaviour is making things even worse,'' a source told the British edition of Grazia magazine.
''Demi was close to singing the papers a couple of weeks ago, because of pressure from the lawyers, but in light of recent events she's not feeling so cooperative.''