Bellamy, whose loan from Manchester City was approved this week, scored in the 84th minute of the game at Cardiff City Stadium which had seen former Sky Blue Jay Bothroyd open his account with a brace.
The victory puts Cardiff second behind unbeaten QPR who won 2-0 at home to Scunthorpe United.
Coventry City are down to fourth despite their 2-1 win against Derby wich temporaily put them top, with Burnley who sent Leicester to the bottom of the table with a 3-0 win, going into third place on goal difference.
There were wins for Leeds, Preston, Norwich, and Ipswich with the games at Bristol City, Hull and Reading ending in draws.
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