What does Katie Holmes and Glee have in common?

Katie Holmes was the big draw at the Calvin Klein show yesterday, where she held court in a cream-colored silk strapless dress and told us both she—and Suri—were mulling over possible guest roles on Glee. We knew the family liked to dance, but now Suri's singing, too?
"We love Dianna (Agron) and we love Glee," Katie told E! News as she sat near Julianne Moore, Isabel Lucas and Kerry Washington in the front row. "And we're going to go hang in her trailer for now and we'll see."