The Crown co-stars Claire Foy and Matt Smith celebrate their new play Lungs

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They have remained firm friends since their starring roles in The Crown. 

And Claire Foy and Matt Smith appeared in good spirits as they celebrated their new play Lungs, which made its debut earlier this week, with an after party in London on Saturday night.

The two stars, aged 35 and 36, attended the bash with the play's writer Duncan Macmillan and director Matthew Warchus. 

Celebrate: Claire Foy and Matt Smith appeared in good spirits as they celebrated their new play Lungs, which made its debut earlier this week, with an after party in London on Saturday

Celebrate: Claire Foy and Matt Smith appeared in good spirits as they celebrated their new play Lungs, which made its debut earlier this week, with an after party in London on Saturday

Claire and Matt put on a chipper display as they shared an in-joke and were later seen in an animated conversation with Duncan.

Looking effortlessly chic, Claire opted for a stunning figure-hugging black dress with a feathered hem.

While Matt looked dapper in a black trench coat, white T-shirt and skinny jeans for the celebration.  

It comes after recent snaps from rehearsals show the First Man actress and her co-star looking delighted as they transformed into the loving couple M and W earlier this month.

Pals: The two stars, aged 35 and 36, have remained firm friends since their starring roles in The Crown

Pals: The two stars, aged 35 and 36, have remained firm friends since their starring roles in The Crown 

Lungs: Claire and Matt attended the bash with the play's writer Duncan Macmillan and director Matthew Warchus

Lungs: Claire and Matt attended the bash with the play's writer Duncan Macmillan and director Matthew Warchus 

The play, which began its run on October 14, follows a couple named M and W, played by Claire and Matt, as they discuss giving birth in the current climate with issues surrounding carbon footprints and political issues.

The pair were first seen together again when they attended the launch of the newly refurbished theatre earlier in that day.

Matt is in a long-term relationship with

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