Emmanuel Acho -- former NFL linebacker and "The Bachelor" host -- just got himself the sickest birthday present ever ... a $6 MILLION mansion!!!
TMZ Sports has learned ... the ex-Philadelphia Eagles player bought the insane Hollywood Hills home for his 31st birthday last month, and he even copped a vacant, 10,156-square-foot lot next to it as well.
We're told the price tag on it all was $6,325,000 ... and check out the pics of the place -- it appears to be worth every penny.
There's more -- the crib also comes with three additional guest suites and features large closets and en suite bathrooms ... as well as a massive kitchen fully equipped with state-of-the-art appliances.
Brooke A. Elliott of Aaron Kirman Group at Compass represented the seller, while Kennon Earl of Rare Properties at Compass represented Acho.