Dirty Picture Puns

So my dad and I were going around the Hollywood walk of fame, and we saw Tom Jones's star. My dad is a big fan, so he took a picture of it, but there was dirt all over it, along with a bunch of the others around it. My dad said "Of course Tom Jones's star is the dirty one." And I said "no dad, that's not unusual," and I got a blank stare until he laughed and gave me a high five