You know Rick Castle (Nathan Fillion) is going to have a hard time with this. Besides having to assist with the occasional murder mystery, Castle is now going to have to deal with a maturing daughter entering the dating scene.Castle's fourth new episode of the season, titled "Punked," studious Alexis Castle ( Molly Quinn) will begin dating a boy named Ashley, whom Castle initially mistakes for a girl. Ken Baumann, most known for his role as Ben Boykewich on ABC Family's The Secret Life of the American Teenager, will play the recurring beau who no doubt will get under Rick's skin. Expect Castle to be a bit disappointed that his little princess is not opening up to him about her romantic life. (Can you blame her?) Let's just hope Castle doesn't find out that Ken turned 21 on August 8 (Molly's only 16).Castle's third season kicks off Monday, Sept. 20.