Jamie Dornan is saddling up for his milestone birthday. 

On Sunday, May 1, the “50 Shades of Grey” star took to Instagram to celebrate his 40th trip around the sun.

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Dornan can be seen taking on a mechanical bull in the hilarious clip, which he captioned, “This is 40”.

The activity was part of what looked like to be a cowboy-themed birthday party.

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The actor managed to hold on for a just a few seconds before being flipped off, as his friends cheered on in the background.

Tan France and Helena Christensen were among the stars who wished Dornan a happy birthday in comments beneath the video.