Jennifer Garner has no shame when it comes to wishing her best pal the happiest of birthdays.
The 46-year-old star took to Instagram to bust out a little tune on the saxophone for her friend Reese Witherspoon on her 43rd birthday.
Garner was dressed in a full marching band uniform, hat and all, as she showed off her musical talent.
Happy birthday! Jennifer Garner dressed in a full marching band costume and busted out A Groovy Kind of Love on her old saxophone as a birthday treat to friend Reese Witherspoon on Friday
'Many moons ago, my high school marching band played this song for homecoming,' Garner penned in an Instagram caption.
'Today I play it for my boo, @reesewitherspoon. ♥️We have a groovy kind of love.♥️ Happy birthday, Lady. #bandgeeksarethebestgeeks #havethebestday'
The Alias actress then proceeded to play a slightly off-key rendition of the 1988 Phil Collins hit, A Groovy Kind of Love.
The song was first released in 1965 by The Mindbenders.
Committed! Garner even wore the classic marking band hat, complete with a giant plume of feathers
'Many moons ago, my high school marching band played this song for homecoming,' Garner penned in an Instagram caption. 'Today I play it for my boo, @reesewitherspoon. ♥️We have a groovy kind of love.♥️ Happy birthday, Lady.
Performer! Jennifer got totally in character as a 'band geek' as she performed the song, albeit slightly off key
Jennifer performed the tune as best she could whilst wearing a giant hat with a big feather plume.
She even held a note extra long so she had time to turn the page of music notes.
Jennifer Garner and Reese Witherspoon are two of Hollywood's closest A-list best friends.
The long time pals often showcase their close bond on social media.