Keep Calm and Push It

Amusing, as the nation waits for the new baby to be born:
Recent Find: Keep Calm #AudreyHepburn
Keep Calm and Stay Classy (with Audrey Hepburn)
Recent Find: Keep Calm and Trust Snape #HarryPotter
Keep Calm and Trust Snape
Recent Find: Homeland Securities
Maybe one that doesn’t bear too much investigation…
Recent Find: Keep Calm and Be Reem
Can anyone tell me what this means, it’s something to do with ‘The Only Way is Essex’ which I’ve never watched….