FOR someone who should be piling on the pounds to play Bridget Jones, Renée Zellweger is spending a lot of time at the gym. The star, who will reprise her role as the beloved Brit next year, has been spotted heading to the gym in Hollywood nearly every morning the past week. Sources say she has a new spring in her step thanks to beau Bradley Cooper — and Renée is so keen, she’s expected to join him in Vancouver where he’s shooting the movie version of “The A-Team.”