The actress and comedian announced the news on The One Show while promoting her new book, I Haven't Been Entirely Honest With You.

Hart also said she had had "a tough few years" after being diagnosed with Lyme disease, telling Alex Jones and Alex Scott "I've mainly been in bed," but added it "hasn't been all doom and gloom... someone put a ring on it".

"I got married at 51, and it's just so lovely," she told the BBC programme.

Hart, who starred in her self-titled sitcom from 2009 to 2015, added she met her husband during the COVID-19 pandemic and while battling "chronic illness when I couldn't get out of bed or get out of the house".

"I'd written Gary for on-screen Miranda and it wasn't until I was 49 that I met my person, and I met him and it's a little undercurrent in the book."

She joked that Tom Ellis, who played Gary, was not her husband.

"I'm not going to reveal how we met as that is a little bit of a twist," she said. "He's my best friend, we have the best fun and I'm just thrilled to be a young bride at 51."

After appearing on The One Show, Hart posted on social media to thank supporters for their well-wishes, which she found "really very touching".

The actress said: "I've got my best friend to do life with and it's wonderful and I'm also utterly thrilled to be back in telly land and having a book out so thanks so much for all your support."

In the video, she then high-fives her husband - who is just out of frame - and jokes that fans got an "exclusive - his hand".

Read more:
Kent bear to have pioneering brain surgery
What Gaza has lost in a year of war
Tadpoles take top prize in greatest wildlife photos

Lyme disease is a bacterial infection spread to humans by infected ticks. Symptoms usually present as a circular or oval rash and flu-like symptoms, according to the NHS.

Some people who are diagnosed with Lyme disease continue to have symptoms including tiredness, aches and loss of energy for years.

Hart's new book, published by Penguin Books, will be released on 10 October.