Valentine's Day for Rihanna?

The way to Rihanna's heart ... is through her lungs ... 'cause the pop star says she got a WHOLE LOTTA MARIJUANA for Valentine's Day ... and she's totally stoked.

Rihanna posted her V-Day haul on Instagram ... along with the message, "Roses are green! Somebody knows how to make me happy."

The question is ... who got her the gift???

We already know Chris Brown has a California weed card -- so he can buy for HIMSELF in CA -- but it's against the law to buy pot for somebody else.

Still, Rihanna doesn't seem concerned.

Read more → Valentine's Day for Rihanna?

Katy Perry & John Mayer Make "Hot" Valentine's Day

John Mayer might just be the luckiest guy on the planet -- because he spent his Valentine's Day alone in a dark room with Katy Perry ... and more importantly, Katy Perry's boobs.

J & K celebrated the holiday of love last night by hitting up the historic Vista Theatre in East Hollywood -- and the photographer who shot the pics tells us, he didn't see a soul enter or leave the theater the entire time they were in there ... roughly two hours.

The theater wouldn't comment on whether John and Katy rented the place out for their own personal use -- but that's the only logical conclusion. Pretty baller.

"A Good Day to Die Hard" is the only movie currently playing at Vista ... but it's unclear if that's what the couple actually watched ... because Katy was spotted leaving the place holding a DVD.

Probably "The Notebook."

Read more → Katy Perry & John Mayer Make "Hot" Valentine's Day