Gwen Stefani and Blake Shelton secretly tied the knot?Some fans seem to think so, after the lovebirds were spotted out and about in Santa Monica, California, over the weekend. In photos obtained by, Stefani appears to be rocking a diamond wedding band next to her engagement ring, sparking rumors that she and Shelton have already said «I do.»According to the outlet, the lovebirds had just gotten back from Oklahoma, where Shelton owns a sprawling ranch.