Josh Duhamel has promised to buy his pregnant wife Fergie a present to celebrate the moment she gives birth to what will be their first child together.

He joked to People magazine that Fergie will definitely be receiving a "push present" as he's so excited to welcome their son into the world and is in awe of how she's handling everything:

"Yes, I will be getting her a push present. I just don't know quite what yet. You got Christmas, you got birthdays, you got Valentine's, you got Mother's Day, you got every other thing in between..."

Duhamel added: "I don't know who came up with this push present idea, but I think it's probably a female."

Meanwhile, Fergie recently revealed details of her pregnancy fitness regime and told InStyle: "I walk on the treadmill for 25 minutes, at a 15 per cent incline and a 2.0 (miles-per-hour) speed. To really give my legs a workout, I do rotations, changing the position of my feet every five minutes - toes pointed inward to tone my inner thighs, outward to target my outer thighs, and straight on to work my glutes."