Yes she can. Wow!

Gordon proposes on the "iCarly" web show to his girlfriend Jodi in the episode "iDo". Later at the ceremony, when she sees Spencer, she falls head over heels for him, and Carly tries to help Gordon to win Jodi's heart back. In the end it's her singing Gordon's song "Shakespeare" that reunites them.

... Carly (Miranda Cosgrove) - "Shakespeare"