Dakota Fanning Wishes Sister Elle a Happy 21st Birthday!

Dakota Fanning heads home after a morning yoga class on Tuesday (April 9) in Los Angeles.

The 25-year-old actress rocked an all red workout outfit as she worked up a sweat.

PHOTOS: Check out the latest pics of Dakota Fanning

Later that day, Dakota took to Instagram to share a sweet birthday message to younger sister Elle on her 21st birthday.

“21 TODAY @ellefanning ! Hard for me to believe. It feels like yesterday that I woke up in the little cot next to Mom in the hospital, and asked “What is it?” Meaning did I have a new baby brother or sister? As we know, I had a sister, and my life got better in that instant. I will always be there to zip up your dress (and maybe hold your hair back tonight 😉 just kidding!!) and help you in every way I can. I LOVE YOU!” Dakota captioned the post on Instagram.

FYI: Dakota is wearing an Outdoor Voices bra and leggings.