If my next birthday does not include a present at the same level as Jennifer Garner playing the saxophone for Reese Witherspoon, I'm a bit upset. Jennifer threw it back into her high school days and put on a fully set up brass band to play a song to her longtime buddy in honor of her 43rd birthday on March 22nd. "Many moons ago, my high school marching band played this song for homecoming, today I play it for my boo, @reesewitherspoon." Jennifer called the comic video. "We have a groovy kind of love," she added, referring to the Mindbenders hit "A Groovy Kind of Love." Between the big hat, Jennifer's unwavering concentration (the flip-flop!) And the fact that she's only casually in a backyard filming this is a truly iconic friendship. This is another reason why Jens Instagram is the best.