Celtic added to the woes of administration-hit Rangers with a comprehensive 3-0 win over their Old Firm rivals in their final Clydesdale Bank Scottish Premier League meeting of the season at Parkhead on Sunday afternoon.
Goals from defender Charlie Mulgrew and midfielder Kris Commons, his first of the season, gave the rampant champions a commanding interval lead.
Striker Gary Hooper scored with a thumping drive soon after the break and it looked for a spell as if the home side were going to hand out a real hammering to the Govan men.
However, three goals were enough for the celebrating Celtic fans who can brag of a 21-point lead, an indication of their superiority this season, even in light of the 10 points Rangers were deducted for entering administration.
In Sunday's other game, Kenny McLean's strike kept Hibernian firmly in relegation danger as Pat Fenlon's side fell to a 1-0 defeat against St Mirren in Paisley.
McLean finished from the edge of the box midway through the second half and St Mirren survived Marc McAusland's 77th-minute red card without any major scares.
Hibs, without top goalscorer Garry O'Connor, suffered another blow to their survival hopes in injury time when Lewis Stevenson was sent off.
Hibs remain just three points ahead of bottom club Dunfermline, who secured their first home win of the season on Saturday against Aberdeen.