The actress helps launch the heiress's clothing line. Plus: Britney, Jessica, Pam, Justin and more

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BUSINESS TRIPPIN'

Sweethearts Matthew McConaughey and Penelope Cruz split up temporarily to make the rounds for their movie Sahara. On Wednesday, McConaughey gets in the sweep of things at the cable channel MuchMusic in Toronto, while Cruz hits New York City for The Late Show with David Letterman. The film opens April 8.