Though many shows have signed off for the summer, TV is still heating up with new series and returning ones to keep us entertained.

And with the Summer 2012 TV line-up, comes some very steamy stars. From those we've loved for decades (Tiffani Thiessen of "Saved By the Bell" and now, "White Collar") to the most charming TV host ("So You Think You Can Dance's" Cat Deeley) to ass-kicking ladies (like "Lost Girl" star Anna Silk) to on-screen teens whose drama sucks us in (i.e. Shay Mitchell of "Pretty Little Liars" and Ashley Rickards of "Awkward"), check out the 20 hottest actresses on TV this summer in the slideshow below.

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  • Olivia Munn, "The Newsroom"

  • Cat Deeley, "So You Think You Can Dance"

  • Jordana Brewster, "Dallas"

  • Rose Byrne, "Damages"

  • Anna Paquin, "True Blood"

  • Moon Bloodgood, "Falling Skies"

  • Anna Silk, "Lost Girl"

  • Meghan Markle, "Suits"

  • Enuka Okuma, "Rookie Blue"

  • Carla Gugino, "Political Animals"

  • Salli Richardson-Whitfield, "Eureka"

  • Azita Ghanizada, "Alphas"

  • Piper Perabo, "Covert Affairs"

  • Tiffani Thiessen, "White Collar"

  • Shay Mitchell, "Pretty Little Liars"

  • Ashley Rickards, "Awkward"

  • Katee Sackhoff, "Longmire"

  • Susan Kelechi Watson, "Louie"

  • Kiele Sanchez, "The Glades"

  • Shawnee Smith, "Anger Management"

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