At the 24th Annual GLAAD Media Awards ceremony in Los Angeles, the 'Silver Linings Playbook' star was joined by the famed film producer as they introduced the former US president Bill Clinton for his Advocate For Change Award.
Drew Barrymore was hosting the yearly event, which recognises the achievements of various branches of the media who represent the lesbian, gay, bisexual and transgender (LGBT) community and issues important to them.
Jennifer slipped up when saying the former commander in chief's name, although the honouree was in good spirits.
He joked: "I don't know why Harvey made Jennifer do that. She really was like 2-years-old when I became president.
"I met her backstage and she looked like she was touring the Museum of Natural History."
Elsewhere at the star-studded bash, the Stephen F. Kolzak Award was presented to Steve Warren by Leonardo DiCaprio and Charlize Theron, and 'The Perks of Being a Wallflower' was given the prize for Outstanding Film - Wide Release.
GLAAD Media Awards Winners 2013
Advocate for Change Award - Bill Clinton (presented by Harvey Weinstein and Jennifer Lawrence)
Stephen F. Kolzak Award - Steve Warren (presented by Leonardo DiCaprio and Charlize Theron)
Outstanding Film - Wide Release - 'The Perks of Being a Wallflower' (Summit Entertainment) (accepted by: writer and director Stephen Chbosky with Logan Lerman, Johnny Simmons and Mae Whitman)
Outstanding Comedy Series - The New Normal (NBC) (accepted by: co-creators Ryan Murphy with Andrew Rannells, Justin Bartha, Georgia King, Jayson Blair)
Outstanding Individual Episode - 'Don't Ask, Don't Tell Me What to Do' 'Raising Hope' (Fox)
Outstanding TV Movie or Mini-Series - 'American Horror Story: Asylum' (FX) (accepted by: show creator Ryan Murphy)
Outstanding Daily Drama - 'Days of Our Lives' (NBC) (accepted by: Freddie Smith)
Outstanding Talk Show Episode - 'At Home with Neil Patrick Harris, His Fiancé David Burtka, & Their Twins' 'Oprah's Next Chapter' (OWN)
Outstanding Los Angeles Theater - 'The Children' by Michael Elyanow