PIC: Kate Gosselin Wears Skimpy Bikini July 4

 Humberto Carreno/ startraksphoto.com

For the Fourth of July, mother-of-eight Kate Gosselin entertained bodyguard Steve Neild and his family at her $1.1 million home in Wernersville, Pa.

At the pool party/picnic, she mostly hid from photographers. However, the reality star, 35 – who last week denied having any plastic surgery except for a tummy tuck – was snapped briefly prancing around in a skimpy bikini.

"Steve brought his two sons and one of their girlfriends, and they all pitched in, playing with the kids and helping with the cookout," a witness tells UsMagazine.com. "They grilled on the back patio behind the house and made a bonfire in the back horse paddock where they roasted marshmallows and hot dogs. The kids were running around laughing and having fun, playing hide-and-seek."

Meanwhile, her ex Jon celebrated the holiday with his new squeeze Ellen Ross.

They enjoyed breakfast at the Wyomissing Family Restaurant in Wyomissing, Pa., before joining some family members at a Fourth of July parade.

Says a source, "They sat along the street, shared snacks and waved to the passing floats and kids throwing candy. Ellen seemed bored and they both spent a lot of time texting and talking on their phones."

After the parade, they went to Jon's pool and laid in the sun for a few hours before packing up and driving back to Harrisburg to Ross' apartment.

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!