Bryan Adams has become a father for the first time.

The 51-year-old Canadian rocker has revealed he and his personal assistant, 31-year-old Alicia Grimaldi, welcomed a baby girl, Mirabella Bunny Grimaldi Adams, on April 22.

He said: "I'm really proud to announce on 22 April, Mirabella Bunny was born. Mother and baby are both well and happy. Thanks in advance for your kind thoughts and wishes.

"She arrived like all good Easter bunnies on Easter Friday."

A friend told the Daily Mail newspaper: "Bryan and Alicia are absolutely thrilled. And Bryan couldn't be happier. I have no doubt he will make an absolutely wonderful father."

Friends of Alicia -- who is believed to be living with the singer-and-photographer in London -- were said to be shocked when Bryan announced the pregnancy in March as many people had no idea they were even dating.

One insider said: "Many of their friends still don't even know that they are a couple, but they are living together at his house."

Alicia is a charity activist and one of the trustees of the Bryan Adams Foundation, a charity registered in the U.K.

According to the foundation's website, she graduated from the prestigious Cambridge University in 2001 with a degree in social and political sciences.