Morning. You're listening to Cosmo's Daily News Update. You may or may not remember Taylor Swift straight-up dragging her ex-boyfriend Joe Jonas during her appearance on the Ellen show back in 2008—but oh, what a throwback. Turns out, T-Swift regrets the pettiness, and brought it up while guest starring on ‘Ellen’ Wednesday. When asked what her most embarrassing moment is, Taylor admitted, “probably when I, like, put Joe Jonas on blast on your show.