The actress wore a black and white sarong while she strode along the beach and later lazed on a sun lounger to catch some rays.
She spent time massaging sun tan lotion onto her skin, concentrating on her face and neck which she needs to keep perfect for her on-camera close up shots.
Hot mama: The former Grey's Anatomy star soaked up the rays while looking stunning in a black bikini.
The 32-year-old Knocked Up star then had a health treat and snacked on a salad while having a refreshing drink handy.
Katherine seemed to find an article in her magazine amusing and chuckled as she read Real Simple magazine.
But she could not be without her trusty 'smokestick' electric cigarette accessory that she never seems to be without these days.
The Hollywood star, who has a two-year-old adopted daughter Naleigh with husband Josh Kelley, is often spotted with the contraption in hand.
In fact, she was seen smoking it earlier this week in upmarket Japanese restaurant Matsuhisa.
Katherine has been using the device for the past nine months after giving up smoking.
She discussed the quit smoking aid during an appearance on David Letterman in September, when she showed the late night host how to smoke her customised 'bejewelled' version.
Describing her efforts to give up the unhealthy habit, Katherine said: 'You start once a week, maybe with a cocktail with friends at a bar, and then you buy your first pack during a really stressful break-up, and then it's downhill from there.'
'I've tried everything. I've tried the patch, I've tried the gum, I've done Chantix, twice, which made me bananas (a prescription medicine used as a quit smoking aid).'
The electronic cigarette uses water vapour and liquid nicotine. It is legal to use inside as the water vapour breathed out by users is harmless to others.
As far back as 2008, Katherine was publicly discussing her battle with quitting after attracting negative press when she was constantly pictured smoking.
Katherine is back in Los Angeles after filming her part in the ensemble comedy New Year's Eve in New York last month.
The actress stepped in at the last minute to replace Halle Berry after she pulled out to concentrate on her custody battle with Gabriel Aubry.
However, it was recently announced that Katherine's next film has been moved its original release date in the summer.
Comedy thriller One For The Money now does not have a definite release date. She co-stars with View anchor Sherri Shephered and screen legend Debbie Reynolds.
Keeping it together: Katherine went for a dip in the ocean and and adjusted herself on her way out to make sure she did not have a wardrobe malfunction (wLy)