Melissa Joan Hart is keeping the sex of her baby a surprise.

The former 'Sabrina the Teenage Witch' star is expecting her third baby with husband Mark Wilkerson but doesn't want to know whether they are having a boy or a girl beforehand.

The 36-year-old actress told People: ''We don't want to know. We found out both other times, but this one we want [it to be] a surprise.''

Speaking at the Big City Mom's Biggest Baby Shower in New York City, the 'Melissa & Joey' star admitted that each pregnancy has been very different for her.

She recalled: ''The first one I was shocked at how much I didn't like being pregnant and how uncomfortable I was. The second time around I didn't even realise I was pregnant because I was so busy chasing a one-year-old.''

This time she has more to juggle than her sons four-year-old Braydon Hart and six-year-old Mason Walter.

She admitted: ''I've had a lot of nausea and exhaustion so it's been a little more difficult, especially when dealing with two kids running around the house. So I'm still trying to figure it all out.''

For her next labour, she would like to have a natural birth if possible.

She confessed: ''[Mason's birth] was completely medically intervened and I wanted my second one totally different so I did a hypnobirthing class and managed to pop Brady out naturally so that's the plan again, but we'll see.''