Claim: Heather Graham starred in the movie The Hangover.

Heather Joan Graham -LRB- born January 29 , 1970 -RRB- is an American actress . After appearing in television commercials , her first starring role in a feature film came with the teen comedy License to Drive -LRB- 1988 -RRB- , followed by the critically acclaimed film Drugstore Cowboy -LRB- 1989 -RRB- , which gained her initial industry notice . She then played supporting roles in films such as Shout -LRB- 1991 -RRB- , Diggstown -LRB- 1992 -RRB- , Six Degrees of Separation -LRB- 1993 -RRB- , Swingers -LRB- 1996 -RRB- and on the television series Twin Peaks -LRB- 1991 -RRB- and its prequel film Fire Walk with Me -LRB- 1992 -RRB- , before gaining critical praise in Paul Thomas Anderson 's Boogie Nights -LRB- 1997 -RRB- as porn starlet Brandy / Rollergirl . In 1999 , she co-starred in Bowfinger and Austin Powers : The Spy Who Shagged Me .   In the 2000s , Graham starred in films Committed -LRB- 2000 -RRB- , Say It Is n't So -LRB- 2001 -RRB- , Mary -LRB- 2005 -RRB- , Gray Matters -LRB- 2007 -RRB- , The Hangover -LRB- 2009 -RRB- and its sequel , The Hangover Part III -LRB- 2013 -RRB- . She also had a role on the television series Scrubs in 2004 , before playing the title character on the short-lived series Emily 's Reasons Why Not in 2006 . She also had recurring roles on Showtime 's Californication -LRB- 2014 -RRB- and Netflix 's Flaked -LRB- 2016 -RRB- .   Noted for portraying characters with vast sex appeal , she often appears in magazine lists of `` Most Beautiful '' and `` Sexiest '' women .  Graham is a public advocate for Children International , and supported the climate change campaign Global Cool in 2007 .