But the best way to say "I love you" is to lurk over your sleeping bae with a camera.
What, don't believe us? Just ask Rob Kardashian, who reminded the world on Thursday that he's ride-or-die with Blac Chyna in the only way he knows how.
"Love this woman right here so f--- y'all with your negative comments," he captioned the angelic photo of his model love slumbering peacefully.
And they say fairytales never come true.
Need more proof that romance never sleeps? Just turn to Rob's sister Kim Kardashian West, who has turned creeping on sleeping Kanye into a veritable art form.
This is what life is about! Our baby girl turned 1 today! We played so hard they passed out while we were watching the game! Happy Father's Day to the best daddy in the world! The way you love our daughter and protect her makes me filled with so much love! #BestDayEver #Twins #HappyFathersDay #HappyBirthday
And Mrs. West isn't the only serial sleep-watcher in Hollywood. Chrissy Teigen clearly has a 'cameras welcome' policy in the bedroom, whether John Legend knows it or not.
Meanwhile, Demi Lovato and Wilmer Valderrama have both made it a point to tell the world – a.k.a. their Instagram followers – that they're sleeping together. And don't blush, we literally mean sleeping together.
We're not sure if Jenna Dewan Tatum woke up like this, but we do know she slept like this, thanks to husband and proud creeper Channing Tatum.
Bella Thorne and Gregg Sulkin once enlisted a third wheel to capture their romantic snooze-fest, because they clearly don't have any qualms about posting REM P.D.A. (it's a thing) on Instagram.
Even Gigi Hadid captured her adorable cutie-pie in sweet repose. Oh yeah, and Zayn was there too.
And rocker Jack Antonoff took it all a step further by making sleeping beauty Lena Dunham his iPhone background.
So, next time you get the urge to preserve the glory of your significant other as a pool of drool gathers on his or her pillowcase, take comfort in knowing it's all part of the celebrity love experience, and photograph away.