Penny's reaction was exactly what Iris was hoping to achieve at the wedding itself. She would never outshine the bride, of course, but she knew it was going to be a big event so there was a good chance there would be some other single ladies looking for a bit of fun; that was precisely why she wasn't taking a plus one.
She smirked, turning in a slow circle to show off the dress from every angle. "I do. I'm not sure which pair I'm going to wear yet, though. And I conveniently live just next door."