And since arriving, the US starlet has done nothing but turn us green with envy with her holiday snaps!
Relaxing in her hammock with a perfect sea view behind her, Lea looked the picture of happiness as she indulged in a little 'me time' while away on her hols.
Captioning her photo, she wrote: "Let the birthday festivities continue... #Mexico."
When she hasn't been chilling out, life has been a beach for Lea and her pals.
Soaking up the Mexican sunshine, Lea and her friends took a break from topping up their tans for a quick dip in their resort's very impressive infinity pool - now that's an ocean view!
And if swimming by the sea or stopping for a quick pose on the balcony isn't on the agenda, taking in the beautiful sunset Mexico has to offer definitely is!
Admiring the sun setting, Lea couldn't help but share the sight with her social media followers and the pretty postcard-worthy pic sure had us all wow-ing and ooo-ing.
Before jetting off on her hols, Lea held a birthday meal fit for a queen. Treating her friends to a dinner date at hers, Lea laid on a six course extravaganza, including a post-dinner cocktail and a candle-topped devils food cake, complete with chocolate buttercream frosting.
Taking to Twitter on her birthday, Lea thanked fans for their well wishes on her special day. She said: "So much birthday love today... Makes me so happy... Thank you all for making this day so extra special!"
And special it certainly was. We wonder what 29 will bring...
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