The baby girl is said to have been delivered Wednesday evening. No other details have been given.
Isla has spoken publicly about wanting to stay home with the baby for a while.
There is no way I am going to worry about missing out on work or the pressure to lose weight,” she said. “At the moment I am not even planning any work. As far as I am concerned I am fully booked up in my personal life and I can’t see beyond that.
“I plan on just colouring in books. I’ll focus on that for the next few years.”