Petra Nemcova glamour red carpet madrid spain Leave it up to a model to wow on the red carpet!

Petra Nemcova worked the press line at Glamour magazine's 10th anniversary party in Madrid on Tuesday, and the former Dancing with the Stars contestant gets high marks from us on her outfit choice! Her blue sparkly number makes her look like a mermaid!

What is that diamond she's wearing on her ring finger? She's been romantically linked to Sean Penn recently after they were caught canoodling in Cannes, so could it be the bad boy actor has put a ring on it? We doubt it, but you never know...