Slimming sisters have made their TV debut with popstar and TV presenter Alesha Dixon on the new WeightWatchers Advert.

Leah and Dawn Carpenter were among 180 members of the slimming group to star in the new three-minute ad launched at the start of the year.

The pair, both from Norbury, joined the slimming group in August 2010.

Leah, 30, lost 21.5lbs to reach her goal weight in February 2011, and Dawn, 24, lost 19lbs reaching her goal just before Christmas.

In the advert the sisters, who attend a meeting at Jury's Inn are seen miming to the track Do It Our Way (Play), written using the experiences of WeightWatchers members.

Leah said: "We had no idea what we were signing up for but I loved it. I really enjoyed the experience and made some really nice friends.

"The fact the song is based on real life experiences is a nice selling point."

Dawn added: "The whole experience was amazing, it was such a confidence boost. I didn't think I could do this before, but now I know I can.

"It was quite emotional, it brought back so many memories and the words of the song really hit home, as it's exactly what you go through."