Britney Spears' Nipples Poke Through Her Shirt After Workout—Hey, It's Cold in the Gym!

It was just, er, hard not to notice as the pop princess was leaving

Hey, it can be really cold in the gym—especially when it's hot outside in L.A.

Britney Spears finished up a workout Thursday and was still showing the effects of a cranked-up AC despite the sunny weather, her sports bra and thin tank-top unable to keep her nipples from poking through.

Sorry, it was, er...hard not to notice. (Where is a sauna suit when you need one?!)

Otherwise, it was just a usual trip to the gym for the incredibly disciplined pop star, who, when she isn't onstage or with her kids, always seems to be just finishing a workout or dance rehearsal. 

And we're hardly the only ones who admire Britney's commitment to her fitness regimen.

None other than Miranda Lambert, whose skinnier than ever bod makes headlines nearly every time she leaves the house, looks to Brit for inspiration—and the "Work Bitch" singer let it be known this week that she appreciated the country singer's kind words.

Miranda was quoted in Women's Health as saying, "Like if I put on Britney [while running], I can picture Britney's body and I'm like, 'Oh! Faster!'"

When Britney read that during her perusal of the latest fitness tips, she Instagrammed the page in the magazine and replied, "#regram So flattered by this @mirandalambert! My sister @jamielynnspears just showed me. You look amazing!! @womenshealthmag."

PHOTOS: Britney Spears' bikini bod