Scarlett Johansson stepped out of The Plaza in NYC on the arm of Manhattan borough president Scott Stringer yesterday. She hosted a fundraiser for the potential mayoral candidate at the hotel and then moved to the Jane Ballroom in the West Village for another event in his honor. Scarlett will also apparently show her support for the politician by filming web campaigns to back him in the race. Scarlett may be putting her star power behind Scott, but she's also making time for another man in her life. Scarlett and ex-husband Ryan Reynolds were spotted at a Radiohead concert last week while Ryan was in town on a break from filming R.I.P.D. in Boston. The duo has been seen together postsplit before, and it looks like they're making their more friendly relationship work, since their divorce was finalized this Summer.