may be on top at the box office once again with Hancock
, but his longtime friend and former rap partner DJ Jazzy Jeff says the success and fame hasn't gone to the Fresh Prince's head.
"He's the biggest movie star on the planet, [but] he's still the same Will – the same good guy," Jazzy Jeff, 43, tells PEOPLE. "He's just a little harder to get in touch with."
The "Parents Just Don't Understand" duo recently reunited for an impromptu show
at the Hancock
premiere in Hollywood.
What's the rapper's take on Smith's happy 10-year marriage to Jada Pinkett Smith?
"He's a hard worker," Jazzy Jeff said at the 33 Club Party presented by MLB.com at the Roseland Theater in New York on Sunday. "Will works like that at everything. You got to put in hard work to make relationships work and that's what he does with Jada."