Katherine Heigl is spotted in her workout clothes in Los Angeles on Thursday.

Katherine also sat down for lunch with her mom and some unknown guests at the Vermont Restaurant.

Earlier this week, Katherine showed us the ‘ugly’ side of underwear.

More pics of Katherine getting her workout on…

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Katherine Heigl is left standing in her underwear while filming scenes for her new movie, The Ugly Truth in Los Angeles on Tuesday.

Katherine’s character is seen following her date out of a restaurant.

As he sped off in his car, Katherine’s skirt is caught in the vehicle’s door leaving her flustered as she pays the valet in what clothing she had left.

See the entire underwear scene when The Ugly Truth is released in April 2009.

More pics of Katherine showing the ‘ugly side’ of underwear…

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Gerard Butler takes a leak in the on-set porta-potty during a film break in Pasadena, Calif. on Monday afternoon.

Gerry, 38, is filming The Ugly Truth with Grey’s Anatomy actress Katherine Heigl, who was seen squatting and smoking as a chimney (as usual).

The Ugly Truth is about a romantically challenged morning show producer (Heigl) reluctantly embroiled in a series of outrageous tests by her chauvinistic correspondent (Butler) to prove his theories on relationships and help her find love. His clever ploys, however, lead to an unexpected result.
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Katherine Heigl shoots scenes during her first weekend from her new romantic comedy The Ugly Truth.

Katherine, 29, came out out of the restaurant where she was filming for a quick smoke break and an iced coffee. She was accompanied on set by her mother.

The Ugly Truth is about a romantically challenged morning show producer (Katherine), who is reluctantly embroiled in a series of outrageous tests by her chauvinistic correspondent (Gerard Butler) to prove his theories on relationships and help her find love.

The Ugly Truth is scheduled to be released in April 2009.

More pics of Katherine showing us the ugly side of truth…

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Katherine Heigl arrives at Prospect Studios in some bright green garb in Hollywood to go back to work on Grey’s Anatomy on Thursday.

Katherine seems to be loving the extra brightly colored clothing, as we saw her last week in a bright, multi-colored coat.

Katherine recently admitted being a little shocked and embarrassed after trying to get the attention of her co-star TR Knight who then told her he was gay.

“When we were filming the pilot I was single and so was he and I kind of had my eye on him. I was getting nowhere and I was super-confused. I was like, ‘Hello? Do I have something hanging out of my nose? Why aren’t you paying any attention to me?’ Needless to say, it quickly became a friendship once he told me.”

More pics of Katherine in her green garb…

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Katherine Heigl goes to the Beverly Center with her husband Josh Kelley in Los Angeles on Thursday.

There had been some rumors flying around that Katherine, 29, would would be leaving Grey’s Anatomy because of her recent box office successes, but she insists she’s looking forward to returning to the show and her role as Dr. ‘Izzie’ Stevens.

She says, “When I come back to Grey’s, I am actually really excited. After nine months a year for four years, of course you’re going to think, ‘I want to be someone else for a while.’

“I landed really good things and I did them in my breaks. It broke up the monotony of the character and I’m very, very grateful for opportunities. But Grey’s is such a good cast. Everybody is amazing.”

15+ pics of Katherine shopping and pumping gas in her colorful apparel…

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