Rose Byrne is not only going into Oscar night as a first-time nominee for her work in “If I Had Legs I’d Kick You,” but she’ll also be reuniting with her “ Bridesmaids ” co-stars. Sources tell me that a “Bridesmaids” reunion is in the work during the ceremony with Byrne, Kristen Wiig, Maya Rudolph and Melissa McCarthy. Final details are currently being discussed. The occasion will mark the 15-year anniversary of the hit comedy’s release. Directed by Paul Feig, “Bridesmaids” was written by Wiig