Lovenkrands took his tally for the season to five goals
Peter Lovenkrands scored a hat-trick as Newcastle easily outclassed Plymouth to reach the FA Cup fourth round.
Jonas Gutierrez sprinted down the left and cut the ball back for the Danish striker to fire into the net.
Lovenkrands made it 2-0 before half-time with a near-post header, and put the result beyond doubt with a low shot which Romain Larrieu should have saved.
Plymouth rarely threatened Tim Krul's goal as the Magpies strolled to a fourth-round tie away at West Brom.
The result extended Newcastle's unbeaten run to 13 games and emphasised the gulf in class between two sides at opposite ends of the Championship table.
Newcastle manager Chris Hughton made six changes to the side that drew the first game 0-0 at Home Park, recalling first-team regulars Jose Enrique, Steven Taylor, Kevin Nolan, Gutierrez and Lovenkrands.
And the former Denmark international took only 10 minutes to fully justify his recall.
Gutierrez carved Plymouth open down the left and pulled the ball across for Lovenkrands to beat Larrieu with a deft left-footed finish.
90:00+2:45 The referee blows his whistle to end the game.
90:00+2:12 Rory Fallon is flagged offside by the assistant referee. Tim Krul takes the free kick.
90:00+1:50 Karl Duguid fouled by Kevin Nolan, the ref awards a free kick. Carl Fletcher takes the direct free kick.
89:19 David McNamee challenges Danny Guthrie unfairly and gives away a free kick. Ryan Taylor has an effort direct from the free
kick, blocked by David McNamee.
87:04 Indirect free kick taken by Tim Krul.
87:04 Substitution Ryan Donaldson replaces Peter Lovenkrands.
87:04 The official flags Luke Summerfield offside.
85:06 Sanchez Jose Enrique crosses the ball, save by Romain Larrieu.
83:54 Jonas Gutierrez takes a shot. Save by Romain Larrieu.
82:36 The ball is crossed by Cillian Sheridan.
79:25 The referee gives a free kick against David McNamee for handball. Sanchez Jose Enrique takes the direct free kick.
75:25 Romain Larrieu takes the direct free kick.
75:25 Substitution David McNamee joins the action as a substitute, replacing Chris Barker.
75:25 Foul by Kevin Nolan on Luke Summerfield, free kick awarded.
74:24 Kevin Nolan restarts play with the free kick.
74:24 Substitution Nile Ranger on for Nicky Butt.
74:24 Carl Fletcher concedes a free kick for a foul on Andrew Carroll.
73:08 The ball is sent over by Andrew Carroll.
71:39 The assist for the goal came from Kevin Nolan.
71:39 GOAL - Peter Lovenkrands:Newcastle 3 - 0 Plymouth Peter Lovenkrands finds the back of the net with a goal from inside the six-yard box to the bottom left corner of the goal.
Newcastle 3-0 Plymouth.
71:13 Andrew Carroll produces a cross.
70:31 Foul by Rory Fallon on Kevin Nolan, free kick awarded. Sanchez Jose Enrique takes the direct free kick.
69:42 Substitution Danny Guthrie is brought on as a substitute for Fabrice Pancrate.
69:24 Fabrice Pancrate sends in a cross.
67:41 Nicky Butt challenges Rory Fallon unfairly and gives away a free kick. Carl Fletcher restarts play with the free kick.
67:11 Fabrice Pancrate sends in a cross.
64:24 Corner taken by Ryan Taylor.
64:17 Jonas Gutierrez delivers the ball, Chris Barker manages to make a clearance.
62:23 Inswinging corner taken right-footed by Ryan Taylor from the left by-line.
61:49 Free kick awarded for an unfair challenge on Andrew Carroll by Kari Arnason. Free kick taken by Nicky Butt.
61:27 Rory Fallon takes a shot. Save made by Tim Krul.
61:03 Sanchez Jose Enrique crosses the ball, Romain Larrieu makes a save.
60:02 Jonas Gutierrez has a shot on goal from outside the area which misses right.
58:39 Substitution Alan Judge leaves the field to be replaced by Cillian Sheridan.
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