Peter Sarsgaard and Maggie Gyllenhaal kiss and give a tummy flash. Plus: Jennifer, Mandy, Mariah and more

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SHOPPING AROUND

Are they back on? Paris Hilton and former beau Stavros Niarchos browse for DVDs together Saturday at a Tower Records in Hollywood. The duo kept close company over the weekend: Niarchos also attended a birthday party the hotel heiress threw for pal Caroline D'Amore at her Hollywood home.