There were plenty of episodes in "Cheers" where you could clearly see Bebe was quite the looker. They had to go pretty far in her usual Lilith look to make her look frumpy. But there were plenty of times when Lilith would let her hair down and it was like WOW! (See: The episode where she buys Sam in a bachelor auction.)
I once saw her standing outside a restaurant in the West Village. Yes, she's quite attractive in real life.