The former club-mates have led their country to a spot in the last eight
Both have been key contributors for the five-time World Cup winners, reuniting their partnership that was first seen at Brazilian club Sao Paulo almost a decade ago.
Fabiano has netted three times in four games, two of those goals coming from assists delivered by the Real Madrid star.
Now the pair are preparing to face Holland in the quarter-finals on Friday, and both have hailed the way they have gelled with each other in South Africa.
"We have a perfect connection,'' Fabiano told Sky Sports.
"We understand each other. I just have to get in position and I know he will get the ball to me.''
Kaka set up Fabiano in Brazil’s 3-1 victory over Ivory Coast and again in a 3-0 triumph over fellow South American side Chile in the Round of 16.
"We have a very good connection, especially because of the time we played together for Sao Paulo. One look is enough to know what we are going to do," Kaka said.
"I hope to give him many more assists in the rest of the World Cup and that he ends up as the top scorer.''
Argentina striker and Real team-mate Gonzalo Higuain, Spain's David Villa and Slovakia's Robert Vittek sit one goal ahead of Fabiano in the race for the World Cup top scorer, but the Sevilla hitman is only concerned with helping Brazil win the competition for a sixth time.
"I'm trying to help Brazil win the title, that's what I want,'' said Fabiano.
"If in the end I'm also the top scorer, better.''
Kaka has not scored so far in the World Cup, but is content to keep playing his role as playmaker for the Brazilians.
"That's fine,'' Kaka said.
"Of course everyone wants to score goals in a World Cup, but honestly, it's not something I worry too much about. I'm happy to keep helping my team-mates score so Brazil can keep winning.''