London: 'Black Hawk Down' actor Josh Hartnett and partner Tamsin Egerton, who have been dating since 2012, have welcomed their first child.

Hartnett, 37, and 27-year-old Egerton were seen leaving St Mary's Hospital in London on December 1, with the proud father carrying the new arrival in a car seat, reported Female First.

The couple have not yet confirmed whether they had a boy or a girl, or any other details about the baby's birth.

The pair, who first met on the set of "The Lovers" in 2011, confirmed in July they were expecting a baby.

Their representative said at the time: "It's true and they are beyond thrilled."

Hartnett previously dated actresses Kirsten Dunst, Scarlett Johansson and Amanda Seyfried.