President Obama celebrated his 55th birthday - his last before leaving office - with a big White House bash jam-packed with Hollywood A-listers. Attendees included talk show host Ellen DeGeneres and Portia de Rossi , Common , Fonzworth Bentley, Chicago mayor Rahm Emanuel, NBC's Al Roker , George Lucas , interim chair of the Democratic National Committee Donna Brazile, retired basketball player Grant Hill, "Good Morning America" anchor Robin Roberts, Sarah Jessica Parker , Pusha T, Samuel L. Jackson , Nick Jonas , who took a break from his tour with Demi Lovato , called the evening "A night I will never forget" on Twitter.