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Hilary Duff celebrates son's birthday with ex

Hilary Duff celebrates son's birthday with ex

Hilary Duff and Mike Comrie reunited to celebrate their son Luca's birthday.

The former married couple proved they are still a team when it comes to their little boy - who turned four years old on Sunday (20.03.16) - when they gave him a celebration to remember and taught him how to ride a bike together.

Hilary posted a touching picture of Luca wearing a bicycle helmet flanked by his grinning parents and captioned the picture of the family: "We are so proud of this boy!"

The pair were also joined by their extended family at a birthday dinner at Hilary's mother's home, as a series of Snapchat posts - including a group photo - showed.

Sister Haylie Duff wrong on one photo: "Family chaos at Mama Suz's house."

The 28-year-old actress and 35-year-old retired hockey star - who share joint custody of Luca - split in 2013 and finalised their divorce last month.

The couple had a pre-nuptial agreement and Hilary was granted permission to keep their Beverly Hills mansion, although she had to buy Mike out for $2,408,786 and she keeps any of their other shared property, but Mike gets his Bentley coupe and Mercedes G-Class SUV.

Speaking previously about their post-split relationship, Hilary insisted the couple are still extremely close, especially for the sake of their kids.

She explained: "We have such a great kid. And we're both so obsessed with him.

"We are good friends and we laugh a lot. And we have a great communication and we share pictures when one is not with Luca. He's great, we are great and we keep on trucking.

"Mike and I were very in love when we met. We both really wanted to get married. I'd been working since the age of 11 or 12, so making that choice at a young age seemed right for me. Maybe it wasn't, but we spent the majority of our time together really happy."