Bruce Willis has talked openly about how important it was to get know his ex-wife's new husband for the sake of his children.

And now it seems Demi Moore is returning the favour.

She invited her 53-year-old ex-husband Bruce Willis and his lingerie model girlfriend Emma Heming, 27, along to the New York premiere of her new film Flawless.

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Good friends: Demi Moore invited her ex-husband Bruce Willis and his new girlfriend Emma Heming to the premiere of her film Flawless in New York. The couple's daughter Tallulah also attended last night's event

Bruce's former and current flame – who observers have regularly noted look strikingly similar - mingled happily on the red carpet without a hint of awkwardness.

They were joined by Bruce and Demi's youngest daughter Tallulah Belle, 14, as their other daughters Rumer, 19, and Scout, 16, sat the night out.

The 45-year-old actress's husband Ashton Kutcher, 30, also missed the event – he was back in LA where he is filming the comedy Spread, in which he plays a serial womaniser.

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In step: Bruce is encouraging Emma to get to know his family in a sign the relationship is getting serious

The day before, Bruce and Emma took Tallulah out for breakfast in LA - a sign their relationship is becoming increasingly serious.

"Bruce has fallen for Emma big time," a source said.

"He is in it for the long-term with her.

"He has enjoyed the bachelor lifestyle for a good few years but thinks the time is right to settle down," the source added.

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Leading man: Demi's husband Ashton Kutcher missed the event - he is currently on set of the comedy Spread in Los Angeles

While Willis is now so close to the Charlie's Angels star and her husband - they even holiday together - he has admitted their relationship wasn't always so harmonious.

He credits Will Smith for changing his attitude to his former wife's then-boyfriend.

"During some very dark hours [Smith] talked to me about it.

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Don't look now, Demi: Ashton films scenes with his attractive costar Margarita Levieva

"He said: 'Dude, you've got to do whatever it takes to get the kids and all the spouses or the girlfriend together. You've got to show your kids it's okay.'

"It was like a light went on. Ding. In the luck of the draw I am fortunate to have Ashton in the family.

"It took a long time for people to wrap their minds around the fact that I could be friends with my ex-wife's new husband, but we are friends."

Despite splitting up in 1998, 11 years after they married, the action star revealed recently: "I love Demi, and I know she loves me."