Reese Witherspoon, Sarah Michelle Gellar and Selma Blair, stars of ’90s teen seduction tale “Cruel Intentions,” reunited Thursday in Los Angeles at Rockwell Table & Stage’s “The Unauthorized Musical Parody of Cruel Intentions.” Roger Kumble’s 1999 pic, based on “Dangerous Liaisons,” catapulted the stars to fame, including then-couple Witherspoon and Ryan Phillippe, earned Gellar and Blair “Best Kiss”...