Jaimie Alexander (b. March 12, 1984 in Greenville, South Carolina) is an actress who portrays Jessi XX on Kyle XY. She previously played Caitlin Porter on the MyNetworkTV serial Watch Over Me. Born in South Carolina, she was raised in Grapevine, Texas before relocating to Los Angeles. Alexander appeared in "The Other Side," "Squirrel Trap" and a starring role in Rest Stop, as well as FX's It's Always Sunny in Philadelphia and Fox's Standoff.