Reese Witherspoon  got her start in Hollywood about 20 years ago and has been a bright spot on the scene ever since. Reese has a lot to smile about these days — she's approaching her four-year marriage anniversary to husband Jim Toth; she has three adorable growing kids; she was nominated for an Oscar for 2014's Wild; and she has a new movie with Sofia Vergara . Perhaps most exciting of all, Sunday was her 39th birthday! While hitting award shows and red carpets and meeting up with her famous friends, Reese has turned on her infectious grin, and her ear-to-ear smile is sure to make you crack a grin, too. Keep reading to see her smiley moments, and then relive her memorable performance in Legally Blonde .
A 15-year-old Reese bit her bottom lip at an LA premiere in October 1991.
She showed off her smile on the red carpet in LA in July 1994.
Reese's big smile was front and center at the LA premiere of Waterworld in July 1995.
Reese and Elizabeth Banks proved that blondes have more fun during the Vanity Fair Oscars afterparty in March 2014.
Reese got playful with a mask at the Romeo & Juliet premiere in LA in October 1996.
Reese had a blast at the 2013 Oscars in February in LA.
Her infectious smile was front and center while she held hands with husband Jim at a Golden Globes party in January 2015.
She smiled and waved at the world premiere of The Frighteners in LA in July 1996.
Her grin was on display at the 1997 Vanity Fair Oscar party in March in West Hollywood.
She was a vision in red while presenting an award at the Golden Globes in January 2012 in LA.
Reese and Ryan Phillippe  looked happy at an LA event in February 1998.
Reese and Cameron Diaz  met up at Rag & Bone's new LA store opening in October 2012.
Reese took the stage at the March of Dimes ceremony that honored her in December 2012.
Reese wowed at the Oscars in February 2015.
A pregnant Reese was all smiles at the LA premiere of Election in September 1999.
She was all dolled up at the Golden Globes in January 2001 in LA.
She was beaming while presenting an award with her Mud costar Matthew McConaughey  at the Independent Spirit Award in March 2014.
She looked fresh at a screening of Legally Blonde in NYC in January 2001.
Reese and Ryan Phillippe  had matching smiles at an LA premiere in June 2001.
Her smirk lit up the red carpet at the Oscars in February 2007.
She lit up the red carpet at the Palm Springs International Film Festival in January 2015.
Reese posed with her kids, Ava and Deacon Phillippe, as she received her star on the Hollywood Walk of Fame in LA in December 2010.
Reese couldn't contain her excitement at the People's Choice Awards in January 2006.
She smiled big at the 2002 Oscars in LA in March.
She looked excited at son Deacon Phillippe's soccer game with Jim Toth in October 2012.
She let out a laugh with Ben Affleck  at the MTV Movie Awards in June 2002 in Santa Monica, CA.
Reese rocked a grin at a press conference in London in June 2003.
The actress showed off her megawatt smile at the premiere of Wild in November 2014.
She had a smile on her face during the Avon  Walk For Breast Cancer in Washington DC in May 2008.
Reese posed for a picture during the 2004 presidential election in March in LA.
Reese and Jim Toth shared a laugh-filled walk in January 2012.
Reese was reunited with pal Jennifer Aniston  at the Elle Women in Hollywood event in October 2011.
Reese's smile was still the center of attention despite her darker hair at the NYC premiere of Vanity Fair in August 2004.
She took the microphone at an event in LA in December 2004.
She smiled as she talked on her phone in LA in December 2012.
Reese had a tan to complement her grin at the opening night of Wicked in LA in June 2005.
She and Jennifer Aniston  both grinned at a 2005 charity event in LA in October.
Reese complemented her smile with red lipstick at the NYC premiere of Walk the Line in November 2005.
Her smirk was on display at the Critics' Choice Awards in Santa Monica, CA, in January 2006.
Reese beamed as she showed off her Oscar for Walk the Line in February 2006.
She was honored to meet the Duchess of Cambridge in July 2011.
Reese was picture-perfect at the LA premiere of Four Christmases in November 2008.
Reese gazed at then-boyfriend Jake Gyllenhaal  during a Lakers game in January 2009.
She happily signed autographs for fans in December 2010.
She and husband Jim Toth both grinned during a basketball game in LA in January 2011.
Reese was beaming while accepting her award at the MTV Movie Awards in June 2011.
Reese glowed at an event in LA in March 2010.