50.Blake Lively and Penn Badgley

Gossip Girl fans can attest how Blake Lively and Penn Badgley looked good together. Their on-screen chemistry as Serena van der Woodsen and Dan Humphrey was like Romeo and Juliet in a different setting. As good as it gets, the on-screen chemistry became a reality when they were captured locking lips during a vacation. Admittedly, the actors initially tried to deny the rumors of their coupling as they fear it will not please their bosses and might wreck their young careers.

On the flip side, the management was pleased about their romance as they thought it could do good for the show. Their relationship came to an end in 2010 after three years of dating. The two split amicably and did not let anyone know about it. As such, they were given high credits for their professionalism as their breakup did not affect their chemistry on set.