08/12/2013 10:18 am ET

'Suits': What's Different About Donna In 'Shadow Of A Doubt' Sneak Peek? (EXCLUSIVE VIDEO)

"Suits" fans: There's definitely something different about Donna!

HuffPost TV has an exclusive sneak peek (above) at this week's episode, titled "Shadow of a Doubt" (airing Tues., Aug. 13 at 10 p.m. ET on USA), which finds Harvey's right-hand lady, Donna (Sarah Rafferty), positively glowing ... thanks to the fact that she's sleeping with the British Harvey, a.k.a. Stephen (Max Beesley). If Harvey (Gabriel Macht) is mad that she said she "made copies" for Stephen, what would he say if he found out the truth?

The love life advice-giving tables have turned with Donna and Rachel (Meghan Markle), but the ladies just better hope that Louis (Rick Hoffman) doesn't figure out what's going on. The only thing Louis loves more than finding out a good secret is holding it over Harvey's head.

Watch HuffPost TV's sneak peek to see Louis' priceless reaction to Donna's glow: "Promise me you keep doing whatever it is you're doing," Louis says. "I'm serious Donna -- morning, noon and night. Five times a day if necessary."

"I will do my best," Donna replies coyly.

(Editor's note: It's worth pointing out that stills from this episode show Donna and Stephen together in the file room. And we all know what kind of steaminess happens in the file room.)

Tell us: Do you think Harvey will find out? Will Donna cave and tell him? And would it ruin their work-spouse vibe if she does?

"Suits" airs Tuesdays at 10 p.m. ET on USA.

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