Hollywood beauties Jaime King, Christina Hendricks, Ellen Pompeo, and Whitney Port celebrate the launch of Hunter's Alley downtown; the cast of "Girls" does a Q&A in North Hollywood; Marvel's Captain America: The Winter Soldier holds its star-studded premiere and after party with stars Chris Evans, Samuel L. Jackson, Scarlett Johansson, Cobie Smulders and more; model Alessandra Ambrosio debuts her new line at Planet Blue in Beverly Hills—get the scoop on Thursday's top L.A. events in today's Last Night's Parties.