Katharine McPhee, Patricia Arquette, & Emily Wickersham Kick Off Summer at CBS Rooftop Soiree!

Katharine McPhee shows off some skin as she arrives at the 2015 CBS Television Studios Rooftop Summer Soiree held at The London Hotel on Monday (May 18) in West Hollywood, Calif.

The 31-year-old entertainer was joined by her Scorpion co-stars Elyes Gabel, Ari Stidham, CSI‘s Patricia Arquette, NCIS stars Emily Wickersham, Pauley Perrette and Sean Murray, The Odd Couple‘s Matthew Perry, Lindsay Sloane and Yvette Nicole Brown, Extant‘s Grace Gummer, and The Late Late Show host James Corden.

Also in attendance: Rachel Skarsten, Kathrine Herzer, Adelaide Kane, Kyle Bornheimer, Jane Lynch, Maggie Lawson, Torrance Coombs, Justin Baldoni and his wife Emily Baldoni, Julie Chen, Aisha Tyler, Marg Helgenberger, and Bow Wow.

FYI: Katharine is wearing a RVN dress, Bionda Castana shoes, Emm Kuo clutch, and Marina B. earrings. Emily is wearing a Self-Portrait look, Kurt Geiger shoes, Ileana Makri jewels, and carrying a Lee Savage clutch. Patricia is wearing Kurt Geiger shoes.

55+ pictures inside of Katharine McPhee, Patricia Arquette, and others at the CBS Summer Soiree…