How did she lose it? That's the big question What has Amrita Arora done to herself?

She was spotted at Akshay Kumar-Twinkle's wedding anniversary bash on Sunday night looking ekdum alag.

The actress seems to have suddenly lost all her post-baby flab. Malaika Arora Khan's younger sister appeared to be very slim even thinner than what she was before.

Says a source, "Amu has definitely undergone something. She has lost oodles of weight.

She has made trips to Dubai and Thailand in the recent past and it appears that she has either gone under the knife or resorted to something to knock off the inches instantly."

For the past several months, Amrita had been spotted at bashes and events with her pregnancy flab but at Hrithik Roshan's birthday party earlier this month, she stepped out looking reed-thin.

But Amrita maintains it is all hard work. " I have been gymming and dieting. My baby will be a year old on February 5. It has taken me almost a year to achieve it."

About suddenly looking thin she states, "All these months people were used to seeing me with all my flab. Now that I have lost weight, the difference is extremely noticeable."

The actress now weighs 50 kilos what her weight was before her marriage in March 2009.

She has been working out at Zarine Watson's fitness centre that has several B-Town stars sweating it out.

Amu has also been doing yoga with her friend Kareena Kapoor's yoga instructor Payal Gidwani's team member.

"Both Malaika and I have small frames so it was only during pregnancy and later that I appeared large. Now I have gone back to what I was, " she adds.

And all this is not for the silver screen in particular. "I am happy playing wife and mommy."