Mathew Horne has been working non-stop for three months
Gavin and Stacey actor Mathew Horne has collapsed on stage in London.
He's been appearing in a play in the city's West End called Entertaining Mr Sloane.
Paramedics were called in when the 30-year-old fell to the stage at the Trafalgar Studios theatre during the second half of his play on Thursday afternoon.
The actor was treated on stage before the manager asked the audience to leave.
His spokesman says he's exhausted after working non-stop for three months.
He went to hospital but left later in the day.
He's going to see how he feels before deciding whether to go back for Friday night's performance.
His last update on Twitter before the collapse read: "What a beautiful day!!! ... For doing a matinée and evening performance! Hope all's tweetness and light for the Team."
His co-star in Entertaining Mr Sloane, Nanny McPhee actress Imelda Staunton, also pulled out of Thursday night's performance after feeling unwell.
Mathew Horne's spokesman told the BBC that he was taken to hospital but released afterwards.
Understudies have replaced Mathew Horne and Imelda Staunton in the play, written in the 1960s by Joe Orton.
Mathew Horne co-hosted the Brits with Kylie and James Corden
Fellow performer Simon Paisley Day called out for any doctors in the house to come forward after Horne collapsed, with the actor lying on the stage for 10 minutes before paramedics arrived.
John Rigby, a BBC producer in the audience, said Horne seemed "absolutely fine" during the first half of the play but that there was a delay after the interval.
It was announced the play would start again in three minutes, but it was 10 minutes before the actors returned to the stage.
Mr Rigby said the audience seemed to believe Horne's collapse was part of the show until fellow actor Paisley Day called out: "I think something has gone wrong, is there a doctor in the house?"
One audience member went to help while another called out for someone to dial 999.
An actor on stage replied: "Don't worry, it's been done".
Mathew Horne has had a busy year. He co-hosted February's Brit Awards with James Corden and Kylie Minogue.
He appeared in Lesbian Vampire Killers with James Corden and the pair have their sketch show on BBC Three called Horne & Corden.
They've also appeared on Comic Relief and in a Teenage Cancer Trust gig together.
The Bafta-winning duo became household names after the success of Gavin and Stacey.
Mathew Horne first performed at the Edinburgh Festival in 2000 before appearing on The Catherine Tate Show and in Channel 4 series, Teachers, in 2003.