'Why NOT to take your girlfriend!' Talulah Riley jokes about THOSE photos of herself at Wimbledon with boyfriend Thomas Brodie-Sangster 

They were seated in the Royal Box on Centre Court for day six of Wimbledon, last Saturday. 

And on Monday, Talulah Riley, 36, took to Instagram to joke about photos taken of herself and boyfriend Thomas Brodie-Sangster, 32, as they watched all the tennis action together.

The St. Trinians star shared an hilarious selection of shots - which showed her yawning, seemingly sleeping and generally putting on an extremely animated display with her actor beau - and made light of her antics. 

Talulah wrote in a lengthy caption alongside her upload: 'Have been in giggles for days at these candid shots from @wimbledon. 

'We posed very demurely at the @champagnelanson sign — Thank you, Lanson, for having us! And for feeding us all day long (lamb wellington, strawberries-and-cream, afternoon tea, pick-and-mix to take to court, lots of Lanson for Thomas. Yum.)

But didn't quite realise how visible we were (all day long…) while watching the tennis. 

'I usually describe myself as ''stoic,'' but having seen these images I'm quite sure I can no longer make that claim…