I used to have more "guilty pleasures," but then matured & accepted that most of them were actually legit great music that I didn't need to be ashamed of liking, no matter how unhip they were -- e.g. Journey, Eagles, Jackson Browne, early Loverboy, Sammy Hagar, Night Ranger. Fuck the snobs.
In more recent decades, I have actually purchased CDs of the single of Madonna's "Ray of Light"; two albums by Anastacia ("Sick and Tired" was all over the radio when I took a 3-week trip in Italy, and it kinda grew on me); a greatest hits album by Robbie Williams (similar - "Millennium" and "Radio" grew on me watching European MTV on trips; I'm an American so I didn't know I was supposed to think he's a cunt). And I will defend Taylor Swift's "Blank Space" as one of the best-written and -arranged pop songs in recent years.