Felipe Contepomi bounced back from his out-of-sorts performance against Munster to fire Leinster to a vital Celtic League win against the Ospreys.
The Argentinian outside-half returned to Lansdowne Road, the scene of last Sunday's Heineken Cup semi-final defeat by Munster, to score 18 points and help Leinster back to the top of the table.
Contepomi and half-back partner Guy Easterby (2) crossed, while back rows Jamie Heaslip and Niall Ronan also got off the mark in Leinster's final home game of the season.
The Ospreys, who lived off scraps, bagged two late consolation tries through replacement winger Jonny Vaughton and centre Gavin Henson, who also kicked three penalties and a conversion.
It took a while for Leinster to settle as Henson kicked the visitors into an early 6-3 lead.
The 2005 Lion, who came in for some notable treatment from the home crowd, missed his opening kick at goal but landed efforts in the 11th and 13th minutes in reply to Contepomi's initial success.
But with little to play for, the Ospreys were always up against it, especially with Michael Cheika's hosts still smarting from their Heineken Cup woe.
A move straight off the training ground saw Easterby romp over for his first try after 19 minutes. From a Malcolm O'Kelly lineout take, Easterby looped around Contepomi and went on 35 metre run-in to the line with only Henson attempting to tackle the Irish international.
Contepomi converted, taking his tally at Leinster through the 500-point barrier (502), and right on 40 minutes, the Pumas star handed off his opposite number Matthew Jones to grab Leinster's second try. Contepomi added an injury-time penalty to his conversion for a 20-6 lead at half-time.
Two minutes after the restart, Henson kicked his third penalty for the Ospreys, whose dismal away form has seen them lose six of their last seven games away from the Liberty Stadium.
But any hopes they had of racking up their fifth straight win against Leinster were soon put to bed. After hooker Bernard Jackman had been held up short, Contepomi added a penalty before number eight Heaslip dummied and sent Easterby scurrying down the left wing for his second and a 28-9 buffer.
Jonathan Thomas, who had switched to number eight, swapped passes with Jason Spice off a close-in scrum for Vaughton to score.
However, Heaslip (69 minutes) and replacement Ronan (80) chalked up Leinster's bonus point to put the province out of sight.
There was still time for Henson to pirouette over in injury-time, but the night belonged to Leinster and in particular, soon-to-be retired flanker Eric Miller, who got a standing ovation from an appreciative crowd at the end.
