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Most people would be in bed nursing a hangover after their birthday party, but not LeLe!

Following her Hawaiian-themed 31st birthday bash on Monday, LeAnn Rimes and Eddie Cibrian packed their bags and flew out of LAX on their way to Washington D.C. so the "Spitfire" singer could perform at an event.

"Wow I'm exhausted!The rain in DC isn't helping #idontfuctionwellontwohoursofsleep" she tweeted earlier this morning.

We don't blame the country cutie for being tired! After all, she's been all over the place in the last couple weeks! The Grammy winner enjoyed a girl's vacation in Cabo San Lucas followed by a trip to Aspen with her beau and his boys before spending a few days at home then taking off for the capital!

We're happy to see her enjoying life... and finally sporting some healthy curves!