Mary-Kate Olsen and her boyfriend, Olivier Sarkozy, were accompanied by her twin sister, Ashley Olsen, to catch a flight out of LAX yesterday. Olivier affectionately held his arm around Mary-Kate, while Ashley walked a few steps ahead as the trio made their way through the airport. The couple are no strangers to showing their affection, and just last week displayed PDA on the East Coast. Mary-Kate and Olivier kissed courtside at a New York Knicks game, which is becoming a routine sight since it was the couple's eighth cuddly time in the stands. Mary-Kate turned her focus from sports to music, though, during her West Coast stay and popped up at a secret Rolling Stones concert with Ashley over the weekend.