Christie Brinkley asked for a restraining order against ex-hubby Peter Cook, and TMZ.com’s sources claim it has to do with Cook’s my-loveless-marriage-made-me-cheat interview with Barbara Walters on “20/20.” Apparently it’s Peter’s weekend with the kids and Mom doesn’t want them watching “20/20” tonight. And really, who could blame her? The judge nixed the TRO and scheduled a hearing at the end of the month.