Sheridan Smith has sparked rumours that she's pregnant by sharing a cryptic post.

The actress, 38, said she was worried about getting bad morning sickness as she set sail for a tour on a cruise ship.

She shared a picture of two VIP passes with lists of other theatre stars appearing in the four day tour, which kicks off today.

Alongside a nauseated face emoji, Sheridan posted on Instagram: "About to set sail for 4 days, wish me luck with my morning sickness."

Her fans have been rushing to send their congratulations, with one writing: "Oh wow what fantastic news."

Sheridan Smith has sparked rumours that she's pregnant (
Image:
Dave Benett/Getty Images)
She made this cryptic post

"Omg...are you having a baby.. if so congratulations ," another posted.

A third said: "Wow, thank you for sharing your wonderful news with us! Congratulations."

Sheridan is engaged to Jamie Horn, 28.

She sparked pregnancy rumours earlier this year when she posted a picture of a babygro, saying she'd ordered one online.

Sheridan and her fiancé Jamie Horn (
Image:
Twitter)
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Recently, Sheridan shared she has been feeling broody after working with the kids at the West End.

She said: "I can’t tell you how much I love the kids. I am gonna miss them so much. They are all an utter joy and have made the whole experience for me.

“I will cherish the memories and watch their careers flourish. Me and Jamie now are thinking of making me a mamma. All thanks to these amazing souls.”

Sheridan, whose TV roles include playing Cilla Black in mini-series Cilla, spoke in March about enjoying living on a farm with Jamie, adding she previously “never pictured myself as a wife and mother”.

She recently said she is feeling broody (
Image:
Instagram)

She questioned in June whether she was ready for children.

Sheridan said: “Could I cope? My mum [says] she knows I could.

“She watched me with my dad in the last days of his life and told me if I could be that caring I’d be a perfect mother.

“But I don’t know. I just know I’m not perfect.”