Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP)
Communication Breakdown; Distraction; Situational Awareness
Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Air Traffic Control Issued Advisory / Alert; Flight Crew Became Reoriented
Environment - Non Weather Related; Human Factors
We were number three for takeoff on schedule.  Third day of a three day trip.  Assigned Runway XXR.  Aircraft ahead was cleared for takeoff; and in a moment of complacency; I taxied across the first hold short line.  First indication that I had done it was from the tower controller asking; 'Flight ABC; where're ya goin'.'  We stopped short of the Runway XXR second hold short line and we're cleared for takeoff shortly thereafter.Cause - Simple complacency; loss of situational awareness; and a false sense of comfort.  I have flown in and out of ZZZ on XXR many times.  I know the hold short lines and their significance at XXR/YY.I should have (and will in the future) emphasized the XXR/YY hotspot more in the departure briefing and should have cultivated more self-awareness during the taxi.  I simply followed the aircraft in front of me in a momentary loss of situational awareness.
At Hotspot number X; taxiing up to hold short of Runway XXR at ZZZ; we inadvertently crossed the first 'hold short' line at the entrance to both runways XXR and YY; but held short of the second 'hold short' line for XXR.  The Tower Controller advised us and cleared a landing aircraft to sidestep to Runway XXL.  We continued the takeoff and remainder of the flight normally.Distraction over my last day of flying before taking a leave of absence.Paying better attention to surroundings and making an extra effort to fight complacency.
Air carrier flight crew reported experiencing a runway incursion.