DUALLY FITTING: With Sunday’s Grammys just days away, nominee Toni Braxton had a last-minute fitting to tend to Thursday with Marc Bouwer. In what was a first for both, the New York-based designer relied on FaceTime and two seamstresses who were with Braxton, a six-time Grammy winner, in Los Angeles to make sure every last pin was in place. The Grammy nominee plans to wear two different Marc Bouwer gowns — one to Clive Davis’ pre-party and the other to the actual awards. The designer could be Braxton’s good luck charm. She wore one of his creations when she won two Grammys in 1997 for her “Secrets” album. That same year she returned the favor so to speak and walked in his Bryant Park runway show.