Melbourne Stars 140-3 (18.1 overs, Pietersen 62, Stoinis 44) beat the Perth Scorchers 139-7 (20 overs, Voges 52, Klinger 44, Worrall 3-25) by seven wickets.
The Melbourne Stars finally got the semi-final curse off their backs, with a seven wicket victory over the Perth Scorchers at the MCG.
Having lost at the semi-final stage in the first four Big Bash tournaments, the Stars will finally appear in the competition's finale.
In what was a repeat of last year's semi-final, the back-to-back champion Scorchers lost the toss and only managed to post 139 from their 20 overs, despite a half-century from skipper Adam Voges.
In reply, the Stars chased down the total with 11 balls to spare, thanks mainly to the innings of Kevin Pietersen who scored 62 to guarantee a home final in Melbourne against the Sydney Thunder on Sunday.
Worrall makes early inroads to slow Scorchers
After being inserted by their hosts, the Perth Scorchers were held back early on thanks to great bowling by Daniel Worrall.
In the first over of the match, Worrall had Marcus Harris caught by Rob Quiney for just one, with Michael Carberry following at the end of the powerplay for 13 after being caught by Peter Handscomb off the same bowler.
The other Scorchers opener, Michael Klinger, stuck about at the other end and found the occasional boundary, steering his side to 36-2 after six overs, where he was joined at the crease by his captain, Adam Voges.
Voges & Klinger kept in check as Scorchers post 139
On what was clearly a slow, low pitch, the Scorchers struggled to hit boundaries despite having two batsmen set for a large period of their innings.
Klinger and Voges batted together for over ten overs, but never really put much pressure on the Stars bowlers who took pace off the ball excellently. Klinger was finally out for 44 when he was caught off the bowling of Adam Zampa, a couple of deliveries after avoiding a close stumping.
Voges reached 52, hitting six boundaries in his 40-ball innings before he was caught on the boundary by Ben Hilfenhaus off the bowling of Michael Beer.
Wickets continued to tumble as the innings came to it's crescendo, with the excellent Worrall dismissing Andrew Tye in the final over as the Scorchers finished on 139-7 from their 20 overs.
Stars get off to fast start despite losing Wright early
Chasing less than seven an over, the powerplay was always going to be important to both sides, with the Stars hoping to get ahead of the rate with fielding restrictions in place.
They were unable to do so though in the first four overs, with the Scorchers limiting them to just 15 runs, for the loss of one wicket. The batsman to fall was Luke Wright, with the Englishman slashing the ball straight to Voges off the bowling of his country-mate David Willey.
The final two overs of the powerplay definitely belonged to the home side though, with Marcus Stoinis and Kevin Pietersen taking 31 runs from the next 12 deliveries, which included six boundaries to give the innings real impetus.
Pietersen half century books Stars place in Sunday's final
After Stoinis and Pietersen had kick-started the innings, the Stars didn't look back and claimed a pretty comfortable victory.
The ageless wonder Brad Hogg got the wicket his bowling deserved, when he had Stoinis trapped in front for 44 to leave the Stars needing just over 50 runs for victory.
That brought Handscomb to the crease, and he played second-fiddle to Pietersen who went past 50 with an array of bullish strokes. On a pitch which others had struggled on, Pietersen timed the ball excellently and took a real liking to Willey who had given him a few words earlier in his innings.
Long after Pietersen had set up the victory, he fell for 62 after being bowled by Joel Paris, and it was left to Handscomb (15*) and David Hussey (7*) to complete the job and see the Stars home with ... balls remaining.