A group of girls from Juilliard and La Guardia high schools tipped off diners at Lincoln Center’s at65 that Jessica Biel was in the café. The teens spotted her through the window, and tipped off her fellow diners by writing Biel’s name in big letters in their notebooks and putting them against the glass for everyone to see. Biel, dining alone, then turned and smiled at the girls. Biel attended the Wednesday screening of “Summit on the Summit,” which documents her ascent of Mt. Kilimanjaro with several other celebs, at the Tribeca Grand.