This painting completed by Diego Velázquez in 1651 is probably one of his most famous works and has been hanging in the National Gallery, Trafalgar Square, for years now. If I remember, I'm going to make a point of seeking it out next time I'm in London and have a spare half hour... I suspect it caused quite a stir at the time, given the level of nudity! You can't help but get drawn in by the blurred face of Venus staring out at you from the mirror but no matter how hard you look you can't make out her facial expression with any certainty - she's definitely looking at you though, that's for sure! 
hebburndelboy
that's a cool pic!