From Michelle Obama calling Barack Obama her "rock" to Cindy Crawford posting a throwback of Rande Gerber, here's how the stars are celebrating love.

Demi Lovato took a moment to spotlight the "love ... "Our first picture together– all these years later, you're still my funny Valentine @randegerber," the model wrote on Instagram.

️" Demi Lovato took a moment to spotlight the "love ... "Our first picture together– all these years later, you're still my funny Valentine @randegerber," the model wrote on Instagram.

In a show where every line is funny, Mach said, Sheppard trusted the actors to bring ... Britney Spears, Katy Perry, Demi ...