Guillaume Hoarau's last-gasp header earned Paris St Germain a dramatic 4-4 draw against Ligue 1 rivals Lyon at the Stade Gerland, but it was not enough to keep hold of top spot.
PSG could take plenty of heart from their display as Guillaume Hoarau's late leveller earned them a point.
Hoarau had put the capital club in front in the 21st minute, but three goals in six minutes from Bafetimbi Gomis, Lisandro Lopez and Michel Bastos stunningly turned the game in Lyon's favour by the 40-minute mark.
Nene converted a penalty on the stroke of half-time to bring PSG back to 3-2, but Jimmy Briand put the hosts further clear early in the second half.
Carlo Ancelotti's men would not lie down, though, and Ceara pulled another one back in the 73rd minute, just two minutes after coming on, before Hoarau completed the comeback at the death.
However, Montpellier replaced them on top of the pile thanks to their earlier 1-0 win over Bordeaux, going one point clear at the summit after John Utaka headed an 80th-minute winner from Marco Estrada's corner.
It was a welcome relief for Montpellier, who had missed the chance to take over first place when they conceded a late equaliser to draw 2-2 at PSG last time out.
At the other end of the table, Ajaccio gave their survival hopes a boost as two goals in two second-half minutes earned a 2-1 win over Dijon.
The Corsicans had not won any of their last three league games after a revival either side of the winter break gave them hope of avoiding an instant return to the second tier, but goals from Eduardo (53) and Johan Cavalli (55) put them in command before Dijon pulled one back through Bernard Kumordzi.
Nice ended a six-match winless run as Anthony Mounier's header early in the second half gave them a 1-0 win against ten-man Caen at the Stade Municipal du Ray. The three points took Nice out of the bottom three on goal difference.
Nancy's tumble towards relegation trouble continued with a 2-0 defeat by Evian.
Kevin Berigaud struck twice in three first-half minutes in Annecy to condemn the visitors to a defeat which leaves them further entrenched in the bottom three.
Auxerre dropped to second from bottom after an inspired performance from St Etienne goalkeeper Stephane Ruffier ensured their game finished goalless.
Elsewhere, goals in the last 13 minutes by Mamadou Samassa and Renaud Cohade guided Valenciennes to a 2-0 win at home to Lorient.