Roberts, who plays his club rugby in France with Racing Metro, led a fine defensive effort at the end of the second half as Wales stood firm in the face of mounting French pressure.
And the centre could not hide his delight afterwards at writing his name in the Welsh record books and keeping Wales' Six Nations title hopes alive ahead of Ireland's trip to Cardiff in a fortnight's time.
"Winning in France is a very special thing and we forget that sometimes and to do it four times in a row makes everyone very proud," he said.
"I remember two years ago we won ugly and again it wasn't the prettiest of games but we've managed to win out here."
"We need to go up another level again to beat Ireland."
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