Literally ashamed? Nah... I don't think anyone here would literally be ashamed though, so in line with the topic: I embrace my love for a lot of Katy Perry's mindless pop garbage because that's precisely what it is, catchy, provocative fun music to play driving with friends and all of that, and it doesn't try to be anything else.
There's plenty of embarrassing songs here and there I could probably name that I have love/hate relationships because of inside jokes and such (Take On Me, In the Air Tonight, the list could go on) and it definitely juxtaposes my typical listening habits and could get some "HAHA, you're listening to WHAT?" reactions.
Are you brave enough to let me see your peacock?