The holders never looked back on Sunday after Kerr, enjoying consecutive starts for the Blues for the first time since returning from her ACL injury, set the visitors on their way to the crushing win in St Helens with two first-half goals in the space of four minutes.
Kerr was later robbed of completing her first hat-trick since returning in September after her headed goal from a corner early in the second half was ruled out by the referee, who felt the goalkeeper had been fouled. It looked a poor decision.
The Matildas skipper was substituted soon after just before the hour-mark, surely missing out on another hatful of goals as the Blues crushed a truly lamentable Liverpool outfit, with Rytting Kaneryd ending up cashing in as the day's lone hat-trick scorer.
There were also goals from Wieke Kaptein, Aggie Beever-Jones, Sjoeke Nusken and, with the most unlikely thunderous run and finish, centre-back Millie Bright as Chelsea rampaged their way to a blockbuster semi-final date at Manchester City in January.
Kerr, who'd scored the winner in the Champions League match at Wolfsburg in midweek, kept her starting place and set the tone in the 13th minute with a sharp strike on the half-turn after being found by a Niamh Charles pass.
Four minutes later, Guro Reiten intercepted and put Kerr in on goal with the Liverpool defence having gone AWOL, the Australian then scoring her club-leading seventh goal of the season in her 15th match.
Chelsea's reward will be a rematch of last year's final against City, who waltzed to a 5-1 victory at struggling West Ham, who didn't even have their injured skipper Katrina Gorry in their ranks to help them put up a fight.
The match will be played in mid-January at around the time that City have suggested their star Matilda Mary Fowler could be starting back in action following her own ACL injury suffered in April's FA Cup semi-final.
The other semi will see European champions Arsenal host Manchester United.
Arsenal booked their place with a laboured 2-0 win at second-tier Crystal Palace on Sunday, but all three of their Matildas helped get them there.
Kyra Cooney-Cross delivered the corner from which Laia Codina headed home their 20th minute opener, Caitlin Foord came close to scoring on a couple of occasions and Steph Catley emerged as a second-half sub, before Stina Blackstenius finally sealed the win in the 93rd minute.
Spurs, with Clare Hunt in their ranks, went down 2-1 to United, who grabbed an 86th minute winner through veteran Swedish international Fridolina Rolfo.
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