Jennifer Garner plays the saxophone to mark Reese Witherspoon’s birthday

Jennifer Garnerknew exactly what to get for the girl who has everything. The actress helped Reese Witherspoon mark her 42nd birthday on Thursday, March 22, with a very special musical tribute on Instagram. 

“Hey, @reesewitherspoon! I don’t know why you’re on my mind today . . .,” Garner captioned her video. In the clip, the mother of three — clad in full in a full marching band outfit —  plays “Happy Birthday to You” on her saxophone. 

The self-proclaimed “band geek” proudly played the alto saxophone at John Adams Junior High in West Virginia.

“You know when you walk in a parade you have to really smoothly go heel-toe . . . because you don’t want to jostle your instrument. You want a steady gait,” she explained during a 2016 appearance on Late Night With Seth Meyers. “You want to key off with the person to your right because you want a straight line. You cannot mess around.” 

Garner wasn’t the only one to give Witherspoon a shoutout on her special day. Her Wrinkle in Time costar Mindy Kaling shared a photo from the set, writing: “Happy birthday, queen, You make life so fun!”

19 PHOTOS
Reese Witherspoon and lookalike daughter Ava Phillippe
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Reese Witherspoon and lookalike daughter Ava Phillippe
LONDON, UNITED KINGDOM - MARCH 13: Ava Phillippe and Reese Witherspoon attends the European Premiere of 'A Wrinkle In Time' at BFI IMAX on March 13, 2018 in London, England. PHOTOGRAPH BY Jamy / Barcroft Images (Photo credit should read Jamy / Barcroft Media via Getty Images)
LONDON, ENGLAND - MARCH 13: Reese Witherspoon (R) and daughter Ava Phillippe (L) attend the European Premiere of 'A Wrinkle In Time' at BFI IMAX on March 13, 2018 in London, England. (Photo by Karwai Tang/WireImage)
LOS ANGELES, CA - FEBRUARY 26: Reese Witherspoon and Ava Phillippe arrive at the Los Angeles premiere of Disney's 'A Wrinkle In Time' held at El Capitan Theatre on February 26, 2018 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
LOS ANGELES, CA - FEBRUARY 26: Reese Witherspoon and Ava Phillippe arrive at the Los Angeles premiere of Disney's 'A Wrinkle In Time' held at El Capitan Theatre on February 26, 2018 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
WEST HOLLYWOOD, CA - DECEMBER 04: Reese Witherspoon and Ava Phillippe attend Molly R. Stern X Sarah Chloe Jewelry Collaboration Launch Dinner on December 4, 2017 in West Hollywood, California. (Photo by Stefanie Keenan/Getty Images for Sarah Chloe Jewelry)
BEVERLY HILLS, CA - JUNE 06: Ava Elizabeth Phillippe and Reese Witherspoon attend NET-A-PORTER x Draper James Event on June 6, 2017 in Beverly Hills, California. (Photo by Stefanie Keenan/Getty Images for NET-A-PORTER)
BEVERLY HILLS, CA - JUNE 06: Ava Elizabeth Phillippe attends NET-A-PORTER x Draper James Event on June 6, 2017 in Beverly Hills, California. (Photo by Stefanie Keenan/Getty Images for NET-A-PORTER)
#GoldenHour with the kiddos ⛅️💓
🌷🌷🌷
With my ❤️always @avaphillippe .. #MotherDaughter #MatchyMatchy #Premiere #BigLittleLies
Celebrating our sweet Tennessee’s 4th birthday last night! 🎂🎈🎉 My forever favorite #NinjaTurtle 💋🐢 #TMNT #FamilySandwich
There’s nothing better than celebrating my birthday with my wonderful kids! 💖🎂💖 #ProudMom
HOLLYWOOD, CA - FEBRUARY 07: Ava Elizabeth Phillippe (L) and actress Reese Witherspoon attend the premiere of HBO's 'Big Little Lies' at TCL Chinese Theatre on February 7, 2017 in Hollywood, California. (Photo by C Flanigan/Getty Images)
LOS ANGELES, CA - FEBRUARY 07: Ava Elizabeth Phillippe (L) and actor Reese Witherspoon attend the premiere of HBO's 'Big Little Lies' at the TCL Chinese Theater on February 7, 2017 in Hollywood, California. (Photo by Jeff Kravitz/FilmMagic)
LOS ANGELES, CA - OCTOBER 30: Honoree Reese Witherspoon (L) and Ava Phillippe attend with FIJI Water at 29th American Cinematheque Awards honoring Reese Witherspoon on October 30, 2015 in Los Angeles, California. (Photo by Charley Gallay/Getty Images for FIJI Water)
LOS ANGELES, CA - OCTOBER 30: Actress Reese Witherspoon, daughter Ava Phillippe (L) and son Deacon Phillippe (R) arrive at the 29th American Cinematheque Award Honoring Reese Witherspoon at the Hyatt Regency Century Plaza on October 30, 2015 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
LOS ANGELES, CA - SEPTEMBER 07: Reese Witherspoon takes her daughter Ava Phillipe and son Tennessee Toth to the country market in Brentwood on September 07, 2013 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
dusty
Me and my girl 💖 #Happy2017
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Meanwhile, Zoe Salanda tweeted, “Happy Birthday @RWitherspoon! Hope today is as magical as you are!”

When Garner turns 46 next month, she can expect a special message from Witherspoon. Last year the Big Little Lies star posted a throwback picture with the caption: “Here’s looking’ at you, Jen! Happy birthday to my gorgeous friend #JenniferGarner who always laughs at my jokes and my bad dance moves. Love you!” 

Witherspoon is currently shooting season 2 of Big Little Lies.

12 PHOTOS
Reese Witherspoon with celebrity friends at the Golden Globes
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Reese Witherspoon with celebrity friends at the Golden Globes
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Actors Shailene Woodley and Reese Witherspoon arrive to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Trae Patton/NBC/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Actors Halle Berry (L) and Reese Witherspoon attend The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Actors Reese Witherspoon and Emma Stone arrive to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Christopher Polk/NBC/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Actors Reese Witherspoon, Eva Longoria, Salma Hayek and Ashley Judd arrive to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Kevork Djansezian/NBC/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Reese Witherspoon and Eva Longoria attends The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Actors Eva Longoria, Sharon Stone, Geena Davis and Reese Witherspoon arrive to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Neilson Barnard/NBCUniversal/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Activist Billie Jean King and actors Reese Witherspoon and Emma Stone arrive to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Christopher Polk/NBC/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Actor Reese Witherspoon attends The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Actor Reese Witherspoon and Jim Toth arrive to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Christopher Polk/NBC/NBCU Photo Bank via Getty Images)
Reese Witherspoon arrives for the 75th Golden Globe Awards on January 7, 2018, in Beverly Hills, California. / AFP PHOTO / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
75th�Golden Globe Awards ? Arrivals ? Beverly Hills, California, U.S.,�07/01/2018�? Halle Berry, Reese Witherspoon. REUTERS/Mario Anzuoni
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Actors Nicole Kidman and Reese Witherspoon arrive to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Trae Patton/NBC/NBCU Photo Bank via Getty Images)
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