Katherine Heigl's neighbors have sprung to her defense after police were forced to interrupt her hot tub hubbub with hubby Josh Kelley.

As RadarOnline.com was first to report, two cops were confronted with an arresting sight -- Heigl in a barely-there bikini -- when they arrived at the couple's $2 million mansion in Los Angeles, after receiving a noise complaint.

Watch the video of the the Knocked Up actress answering the door in her bikini.

Katherine Heigl has a very simple explanation for why she answered the door in a bikini when police showed up at her house Monday night.

RadarOnline.com captured video of the event, showing super sexy Katherine chatting with police after they responded to a noise complaint.

Watch the video on RadarOnline.com

Now iVillage has obtained the rest of the scoop directly from Katherine who says one of her neighbors screamed at her and husband Josh Kelley to be quiet as they chilled in the hot tub, leading to the police visit.

“We were hanging out at home just the two of us. We made ourselves some cocktails, and I had specifically worn a sexier bikini than I normally would because I hadn’t seen (Josh) in two weeks,” Heigl told iVillage.