kevin connolly sticks to another less famous sister

according to people magazine:
Entourage's Kevin Connolly, acting very attentive toward Haylie Duff at Hyde Lounge in Los Angeles. The two sat at a table with Hilary Duff and others, though they made several trips upstairs to smoke together. Back inside, Connolly showed plenty of affection, keeping his arm around Duff's waist as she chatted with girlfriends. Meanwhile, Hilary was having a ball, dancing around and lip-synching to '80s remixes. Also making the scene: Lauren Conrad, Brody Jenner and Calum Best

first nicky hilton. now, haylie duff? i mean, paris has herpes (remember that valtrex found in her storage locker?), so keep off that lawn. but haylie duff...hmmm. i mean. she did make that maxim hot 100 list (they must have run out of girls under 35). but hilary's single, right? there are just some celebrity couples i just don't understand.