Hilary Duff is trying to induce labour by eating salad

Posting a picture of the salad - which was purchased from Caioti Pizza

- on her Instagram Story, Hilary wrote: "This salad is supposed to make you go into labor...@caioti_pizza don't let me down. (sic)”

And the restaurant in question claim the secret is in the “dressing”, though no-one is exactly sure what goes into the “special herbs mix”

that makes pregnant women start having contractions.

An employee told E! News: "We do have a salad that supposedly makes people go into labor. They say it's in the dressing, which is just a balsamic and there are special herbs that make women have contractions and go into labor. None of the servers know what exactly is in the 'special herbs' mix, only the kitchen knows.

"It's true that women have eaten this salad - called The Salad - and gone into labor, it's what Caioti Pizza is known for. There is a whole baby board on the wall and there are at least 15-20 pregnant women a day who come in to order the salad. The ingredients in The Salad are romaine, water cress, Gorgonzola and walnuts with balsamic dressing and the special herbs. It costs $13.95 for a full and $10.95 for a half.”

The ‘Younger’ star - who already has six-year-old son Luca with her ex-husband Mike Comrie - announced her pregnancy in June, and said earlier this month she was “over” being pregnant.

She said: "Honestly, I feel really good and I am a little over it at this point where I am like, 'Cool, I'm ready, when is it happening?'

But it is awesome to have another kid to focus on because you're not constantly focusing on every little ache and pain you feel or anything that happens. I am not on Google right away like I was the first time around. I know what is going on."