David Walliams caused quite a stir amongst his fans on Sunday as he took to Instagram to celebrate Keeley Hazell's birthday.The actor shared two snapshots - one in colour and a black and white version - showing him stood behind Keeley with his arms around her waist as they pose for the camera.MORE: David Walliams gets kiss from model Charlotte Lawrence, 21, and fans go wild WATCH: David Walliams films inside his beautiful London home"Happy Birthday to my beautiful friend @keeleyhazell who is 57