Katherine Heigl lends her support at the 2008 “Hot In Hollywood” event at The Avalon on Saturday in Hollywood, Calif.

Of course, her Grey’s Anatomy costar T.R. Knight and his boyfriend Mark Cornelsen were also present.

Hot In Hollywood is a celebration benefiting charities dedicated to the education, prevention, testing and treatment of HIV/AIDS. In just three years, this celebrity fundraiser has become quite the event. Proceeds from Hot In Hollywood benefit AHF’s (AIDS Healthcare Foundation) HIV Mobile Prevention and Testing Unit, a customized recreational vehicle that travels throughout Los Angeles County to reach underserved populations with HIV/AIDS education, testing, counseling, and treatment referral services.

10+ pictures inside of Katherine Heigl looking hot in Hollywood… More Here! »

Eric Dane, aka Dr. Mark “McSteamy” Sloan, whips out the big guns while filming his hit ABC drama, Grey’s Anatomy, in Los Angeles on Monday morning.

In between flexing his bulging biceps, the 35-year-old actor shot scenes with costars Katherine Heigl, Patrick Dempsey and Brooke Smith.

As reported last month, former Journeyman star Kevin McKidd, 34, will play join Grey’s Anatomy as a doctor who arrives at Seattle Grace after a stint in Iraq.

The Seattle Grace doctors return in a two-hour premiere on Thursday, Sept. 25 at 9PM ET/PT on ABC.

10+ pictures inside of Eric Dane’s bulging biceps… More Here! »

Grey’s Anatomy star Katherine Heigl runs errands and stops off at co-star T.R. Knight’s house in Los Feliz on Thursday afternoon

First, Katherine stopped off at her mother’s house before she paid a visit to her friend T.R. Knight.

Asked if she’s returning to the show next season, Katherine, 29, told Life & Style, “Of course, absolutely. Those people are like my family.”

“It’s so funny because we have such serious material to perform, and then we spend the whole day joking around.”

10+ more pics of Katherine Heigl visiting her Grey’s Anatomy co-star…

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Peek-a-boo!

Grey’s Anatomy star Katherine Heigl peeks out from the side of her house as she rocks out her rainbow bikini while listening to her iPod near her pool in Los Felix, Calif. on Monday.

Although Kat, 29, won’t be #1 with the Emmy’s this year — she’s #1 with AskMen.com! Rounding out the Top 10 Most Desirable Women are: 2. Alessandra Ambrosio 3. Kate Beckinsale 4. Eva Mendes 5. Jessica Alba 6. Scarlett Johansson 7. Jessica Biel 8. Rihanna 9. Marisa Miller 10. Adriana Lima

WHAT DO YOU THINK about Katherine Heigl being the #1 Desirable Woman in the world?

10+ pictures of Katherine Heigl rocking her rainbow bikini… More Here! »

Grey’s Anatomy star Katherine Heigl hits up Hotel Cafe to watch her singer-songwriter husband, Josh Kelley perform with his band in Hollywood on Friday. The 29-year-old actress was later spotted at Goa nightclub with Josh.

(Hotel Cafe is one of the hottest L.A. music venues showcasing the biggest singer-songwriter talent that Hollywood has to offer.)

Heigl, who makes about $200,000 per episode of Grey’s, recently withdrew her name from Emmy contention.

10+ pictures inside of Katherine Heigl hitting up Hotel Cafe… More Here! »

Recently-withdrawn-from-the-Emmy- race-actress Katherine Heigl straps on her bright pink bikini and enjoys some fun in the sun with musician husband Josh Kelley at a beach in Mexico on Sunday.

The couple enjoyed a few drinks while while lapping up the sun on a well-deserved vacation with another female friend.

Kat just wrapped her new movie The Ugly Truth with Gerard Butler.

15+ pictures inside bikini babe Katherine Heigl… More Here! »

Katherine Heigl and hubby Josh Kelley board a private jet headed to Cancun, Mexico for a romantic getaway.

Last week, it was announced that Heigl will star in and produce a film adaptation of Escape, the bestselling memoir of Carolyn Jessop, whose testimony helped convict polygamist sect leader Warren Jeffs.

Heigl’s decision last week to take herself out of the running for an Emmy has fueled rumors she might be leaving Grey’s Anatomy.

10+ more pics of Katherine and Josh going off to cuddle in Cancun…

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Grey’s Anatomy star Katherine Heigl said on Wednesday that she did not put her name in for Emmy consideration this year because she did not feel she was given material to justify it.

Now, a Grey’s Anatomy insider fights back and says, “The show bent over backwards to accommodate her film schedule, and then she criticizes the show for lack of material?” the insider told EW. “It’s an ungrateful slap in the face to the very writers responsible for her Emmy win in the first place.”

Last year Katherine was advised by her own manager/mother that she “didn’t have a shot in hell of winning,” and made a point of telling the Primetime Emmy Awards audience in her speech.

Grey’s Anatomy has slipped in the ratings this past season but is still a top 10 show.