Justin Bieber and Selena Gomez are taking PDA to another level. Before locking lips in front of millions at the Billboard Music Awards -- and being photographed with the Disney star's hand dangerously high on the BieberThigh -- the pair were spotted in all their puppy love glory at LA's airport.

"They are so cute together," a friend who saw the young couple check in together at LAX on their way to Vegas for the awards show. "They cut the line right in front of me in first class and were holding hands and giggling."