Joe Simpson -- I'm a Beach Boy Now

Joe Simpson just scored the ultimate bachelor pad near the beach -- a gorgeous Malibu crib worth nearly $3.8 million.

Jessica Simpson's pop definitely has an eye for prime real estate ... the 5,340 sq. ft. villa has 5 bathrooms and 4 bedrooms, including a master suite with kick ass ocean views. There's also a guest room if Jess and the grands want to hang for a weekend.

It's a ton of space for a single guy, but remember ... Joe's managing models now.

More room to entertain clients, dude.