Selena Gomez just enjoyed what appears to have been a bachelorette party down in Mexico - and on the very same weekend that her fiancé Benny Blanco seems to have had his bachelor party out in Las Vegas. But where was Taylor Swift?! That's the question on everybody's mind when it comes to the Only Murders In The Building star and her longtime BFF at this point. Because Taylor was a no-show south of the border! And that's especially notable because these two so often spend major milestones together! Related: Benny Blanco's Biggest Fear Could Ruin Engagement To Selena Gomez...