As others spent yesterday glowing from a Valentine's Day full of love - Sienna didn't look like she had recieved any heart warming messages of amore. Looking glum and a little rough around the edges Splash spotted Sienna Miller as she popped to her mums briefly before heading to Heathrow airport! Dressed all in black and pixie boots, Sienna was heading towards NYC. So if she was on her way to meet a sexy man across the pond, I hope she planned to change her clothes and brush her hair on the way! More pics after the jump