J-Lo: Bigger than ever but she still won't admit she's pregnant

It has been said that the 38-year-old singer is expecting twins and by the looks of her baby bump on Good Morning America, it can only be a matter of time before the diva confirms the reports.

While she may be keeping 'mum' on the subject, there were further reports last night she is pregnant after her husband's former wife confirmed Lopez is expecting.

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A glowing Jennifer Lopez performing today on Good Morning America. The maternity-style dresses and smiles say it all...

Marc Anthony's ex-wife, former Miss Universe Dayanara Torres, told the Spanish-language media: "I suppose they're going to be very happy."

Last week, Lopez sparked off the rumour-mill as her flimsy costume swirled up duing mid-performance to reveal a distinctly rounded midriff on the usually toned star.

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Keeping mum: J-lo looks radiant

At one point the 38-year-old appeared to hold her stomach protectively during the stage show as the Roberto Cavalli halter top and skin-tight trousers failed to conceal her figure.

An onlooker at the concert in Uncasville, Connecticut, told the New York Post: "A definitive baby bump was there. She was very quick to push down her top.

"Then she talked about how this year is full of firsts for her - and every so often her dress would fly up and you would see her belly."

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Baby Lo?: Jennifer's bump was momentarily on display

Sources close to the star say she is expected to announce her first pregnancy at her New York concert in Madison Square Garden this weekend.

Audience members at her Sweet Face fashion show in New York Fashion Week last month detected a small bump as the actress and designer walked down the runway at the end of her show wearing a baggy green dress from the label.

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Material girl: during the tour Jennifer (with husband Marc Anthony) has worn only loose-fitting outfits

Until now the pop star, who married Anthony, 39, in June 2004, has denied rumours that she is more than three months pregnant.

She has spoken previously of her desire for a family and the couple have experimented with fertility treatments over the past two years.

Her husband has three children from previous relationships.

Marc Anthony pictured with his former wife Dayanara Torres