Lunch Break Video: In anticipation of her 55th birthday, Ellen DeGeneres looks back on past birthdays

The forever young Ellen DeGeneres turns 55 on Saturday and will celebrate the occasion on her daytime show tomorrow.

To get us in a pre-celebration mood, Ellen is sharing highlights from her on-air birthday parties from years gone by which have included surprise appearances from the likes of Julia Roberts, Colin Farrell and Pink as well as wife Portia de Rossi performing Happy Birthday as Marilyn Monroe in a funny parody of Monroe singing to John F. Kennedy when he was president.