Gossip Mill: June 30th,

Julia Roberts is ticked off at Kristen Stewart, whom the Oscar winner considers a "young punk who’s too big for her britches,” reports the National Enquirer. The two women are in competing "Snow White" films, and are now engaged in a “war of words” that the Enquirer notes is “enough to make the Seven Dwarfs blush!”

In Touch reports that Jennifer Lopez is being pressured by Marc Anthony “to quit ‘Idol’” so she can “spend more time with him and their children.” According to the magazine, Lopez “is ready to commit to a few more seasons … but Marc wants her to quit so she can spend more time with him.” So, is this why Lopez says she may not return to “American Idol”?

MediaTakeOut reveals that Britney Spears and Nicki Minaj are constantly “butting heads during their ‘Femme Fatale’ tour” and recently had a backstage “girlfight." A few days ago, after Minaj’s performance ran nearly 45 minutes too long -- encroaching on Spears’ time -- Spears got in Minaj’s face and started “talking shit.”

Star magazine reports that Bradley Cooper has "set his sights on sexy co-star Zoe Saldana." According to the magazine, Saldana and Cooper, who star in the upcoming film, "The Words," have been "getting very up close and personal." Although Saldana has had a boyfriend for 10 years, Star observes they're "unhappy."

Star magazine reports that Jessica Biel is "using" her "Playing the Field" co-star Gerard Butler to win back Justin Timberlake. According to the magazine, Biel pursued Butler only because she knew "seeing her with a guy like him would make Justin jealous," and that the new fling would "catch Justin's attention.

Star magazine drops the bombshell that Kourtney Kardashian has a sex tape that’s “nearly as raunchy as Kim’s,” and will soon be going viral. According to the mag, the footage is “pretty graphic.” But the biggest shocker, says Star, is that Kardashian’s sex tape co-star is NOT her longtime boyfriend, Scott Disick!

Sarah Jessica Parker "didn't appear eager to serve" jury duty, reports the New York Post. The paper explains that while in a New York courthouse, the "Sex and the City" star was "griping to another prospective panelist" that she wanted out of jury duty because "my daughter is at home sick" and also because she had an "international flight" the next day.

George Clooney and Sandra Bullock's bonding on the set of their upcoming film "Gravity" has led to "more than just being friends," reports In Touch. Noting that Clooney's relationship with Elisabetta Canalis has "dramatically cooled," the mag says the handsome actor and Bullock have grown close, leaving Canalis "fearful of losing George."

Tom Cruise and Katie Holmes just bought their 5-year-old daughter Suri a "$100,000 tree house," reports In Touch. According to the magazine, "The mini house has running water, electricity and... shag carpeting!" What's more, Suri's chateau also "comes complete with security cameras and a team of nannies that cater to her every need."