Lafferty treble wins league for Rangers
Celtic, who trailed Rangers by a point going into their game with Motherwell, did their job with goals from Gary Hooper, Georgios Samaras, Shaun Maloney and Paddy McCourt helping them to a 4-0 win. But it was not enough to stop their Glasgow rivals winning a record 54th league championship.
Victory capped off a trophy-laden career for retiring Rangers manager Walter Smith, who won his tenth Scottish championship to go with his five Scottish Cups and six League Cups won during two spells in charge of the Gers.
"Everything you do is for the club," Smith told Sky Sports. "I'm just delighted Rangers have managed to win. I'll have a wee drink just now, I think."
Smith, in his final game in charge, named the same starting side for the fifth successive match and then saw them score a remarkable three goals in just six minutes as the Kilmarnock defence imploded.
Fast start eases nerves
The Ibrox side knew a win would see them crowned champions and it took just 45 seconds for Rangers to get the party started when Lafferty, who had scored the winning goals in Rangers' previous two title wins, scored for the fourth successive match.
Nikica Jelavic knocked the ball on to Steven Davis, who sent a powerful header forward for Lafferty to chase and the Northern Irishman dinked the ball over goalkeeper Cameron Bell from 22 yards.
Any remaining nerves were settled when Steven Naismith scored with just over four minutes on the clock, all but rendering Celtic's effort at Parkhead meaningless.
The Scotland star sent the ball out wide to Gregg Wylde and then raced into the box to get on the end of his cross as he took a touch before lashing it into the bottom left-hand corner of the net from 12 yards out.
Lafferty then created yet more joyful scenes among the visiting Rangers support with the match barely six minutes old. Naismith fed Jelavic wide right and the Croatian rolled a pass across the box for Lafferty to slot the ball low past Bell into the bottom corner.
It took a clearly shell-shocked Killie until the 15th minute to launch an attack, with David Silva firing over after cutting in from the left. Rangers goalkeeper Allan McGregor then got down well to smother Liam Kelly's low drive from outside the box.
Lafferty completes hat-trick
McGregor then produced a great save to stop a fierce strike from James Dayton before some quick feet from Rangers' Davis in the box saw him make room for a shot that struck the outside of the post.
Craig Bryson made McGregor work again when the keeper had to stretch to stop his long-distance strike. Rangers started the second half as they had the first with Lafferty missing a golden chance to claim a third when he fired a first-time effort wide.
But Jelavic made it 4-0 in the 49th minute when he curled a 20-yard free-kick past Bell. Lafferty did, though, complete his hat-trick in the 53rd minute. Tim Glancy's slip let Naismith's pass run through to the Northern Irishman, who stretched to prod home from ten yards.
Rangers captain David Weir, who turned 41 last week, saw a powerful drive blocked by Bell before Killie pulled one back in the 65th minute when Dayton's 25-yard free-kick took a deflection off Maurice Edu on its way past McGregor.