The "Buffy The Vampire Slayer' star celebrated her 40th birthday on Friday and her good friend Shannen took to Instagram to share a sweet tribute to the blonde beauty.
Shannen - who was diagnosed with cancer in 2015 - praised Sarah for standing by her side throughout her battle with the illness, and thanked her for always rooting for her.
Posting a throwback photo of the pair at a party, the former "Charmed" actress wrote: ''Happy Birthday @sarahmgellar I'm posting this pic because of the pure joy and fun, I am clearly having in your presence. From the moment we met, you embraced me, supported me and stood fiercely by my side. Never a moment of insecurity or feeling threatened between us.
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