Duffy reigns supreme in the charts this week as her debut album Rockferry enters at number one.
The soul singer caps off her triumph by making it a month at the top of the singles charts with Mercy single, which is top of the charts for a fourth consecutive week.
The soul singer held off What's It Gonna Be from H Two O and Nickelback's Rockstar, which stayed unchanged at numbers two and three respectively.
OneRepublic climbed four places to number four with Stop and Stare while Taio Cruz and Luciana were at five with Come On Girl.
In the album charts Amy Winehouse's Back To Black deluxe edition slipped from the top spot to two. Nickelback had a good week, up six places to number three.
Nick Cave and the Bad Seeds continued their lengthy career with a new entry at number four for Lazarus, while Goldfrapp's Seventh Tree was down three to number five.
The next highest new entries were The Cardigans' greatest hits compilation at 32 and Billy Bragg's Love and Justice at 33.