‘American Idol’ vet teams up with ‘Telephone’ writer/producer for upcoming album. By James Dinh Kelly Clarkson Photo: Getty Images Kelly Clarkson told fans last week that she’s one song away from completing her brand-new album, and now it looks like that last tune may be the work of none other than super-producer Darkchild. “Taking today to prep the music for tomorrow’s session with @kelly_clarkson. Did a great song for her, can’t wait to get her vocal on it!” the producer tweeted on Monday. Darkchild (whose most recent megahit was Lady Gaga and Beyonc