Sarah Michelle Gellar finds it hard being a working parent.

The 34-year-old star - who has 23-month-old daughter Charlotte with husband Freddie Prinze Jr. - finds it tough juggling her career and being a responsible mother, and constantly worries about her child's wellbeing when she is away from her.

She said: "It's been difficult. My hat goes off to any working parent. It is the hardest to juggle.

"I know my job is by no means the hardest in the world, but to any parents, again, it is so difficult because you're trying to focus so hard but you're always wondering, 'What's my child doing? Are they OK? Did they eat their lunch? Did they eat their vegetables? Did they take their nap?' It's how to separate both them."

Sarah recently returned to the world of TV in 'Ringer', about a sister who is trying to impersonate her twin, and she admits it has been a struggle understanding her role.

She told Entertainment Weekly: "We joke that I actually play five characters. I play Bridget in the past, I play Siobhan in the past. I play Bridget in the present and Siobhan in the present and I play Shiovette, who is Bridget pretending to be Siobhan. So it's very confusing."