Tiffani Thiessen Tiffani Thiessen

Being married to an FBI agent, you're bound to pick up a thing or two; for White Collar's Elizabeth, that's especially true.

"She actually cracks a case on her own," Tiffani Thiessen tells TVGuide.com. "I think after being married for over 10 years to her FBI agent/husband [Peter] she gets pretty smart at it."

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On Tuesday's summer finale (9/8c, USA), Neal (Matt Bomer) and Mozzie (Willie Garson) try to stay one step ahead of the FBI during an investigation into a treasure cache. Thiessen teases, "We have another very big [cliff-hanger] — it has to do a lot with me!"

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In the interview below, Thiessen shares her thoughts about the relationship between Elizabeth and Neal and tells us about how her co-stars often break into song on the set. Plus: Who did Thiessen have more fun playing — Saved by the Bell's Kelly Kapowski or Beverly Hills, 90210's Valerie Malone?