Kourtney Kardashian arrived at a friend's baby shower in Beverly Hills yesterday in a colorful maxi-dress, while Kim stuck to her usual black.

While we didn't get a chance to snap Kim arriving, she did Tweet a photo of her and her assistant and the reality star seems to have added a new accessory to her collection -- a knuckle duster reading "KimYe!"

You think it was a gift or did she buy it for herself?!

Meanwhile, Kourtney's baby daddy Scott Disick babysat their son Mason, treating him to lunch in Beverly Hills. Guess baby Penelope stayed home with the nanny!

Sean Penn hit the road Saturday, taking a long bike ride through Malibu.

The actor just turned 52 last week but still has a better body than a lot of guys half his age!

And while the actor's kept busy working in films, his nonprofit group in Haiti has occupied much of his time. In fact, Penn's J/P HRO group (check out his shirt) was just selected by the Haitian government to lead the demolition of the Haitian National Palace, which will begin next week.

After the 2010 earthquake that destroyed much of the island nation's already-weak infrastructure, Penn has become the unofficial ambassador-at-large for the country in helping to clean and rebuild. Through his group, Penn offered to provide the engineers and equipment necessary to demolish the government building at no cost.

The building has become a symbol of the devastation caused by the natural disaster and Penn hopes it's removal from the landscape will mark a turning point in the rebuilding of Haiti.

Gwen Stefani is getting her boys ready for fall a little early ... by Halloween costume shopping in August!

The No Doubt rocker took Zuma and Kingston to a local costume store where they each picked out a new look - Kingston, a cowboy; and Zuma, Batman.

Then, after a tough morning of shopping, they headed the the park to cool off in the fountains!

Snooki Tweeted the good news this morning, "I am SO IN LOVE with my son Lorenzo Dominic ! I had my little man last night, healthy at 6lbs! HE'S MY WORLD!"

The reality show "meatball" and her fiance Jionni LaValle named their first child Lorenzo Dominic -- he weighs in at 6lbs., 5oz and was born in New Jersey Sunday morning.

The Jersey Shore reality show star later added: "Being a mom is an amazing feeling!!! I love my little man to death! Jionni is such a cute dad."

A rep for MTV said, "The world just got another Guido!!! We couldn't be happier for Nicole and Jionni on the healthy delivery of their baby boy! We look forward to Lorenzo's first trip to the Jersey Shore and can't wait to see his first animal print onesie."



Alyson Hannigan took her two-month-old daughter Keeva Jane for Tea at Infuzion Cafe Saturday.

The second-time mom is taking her time losing the baby weight and slimming down in a healthy way. She recently Tweeted: "I think by Hollywood standards I’m supposed to be in bikini shape now that my baby is 4 weeks old." Ha! At least she has a sense of humor about it!

The working mom looks great; in fact, she's already back on the set of How I Met Your Mother -- the new seasons kicks off Sept. 24.



Katie Holmes is keeping Suri active amid all the divorce drama ...

Katie's divorce from Tom Cruise was finalized this week, making it one of the quickest turnarounds in Hollywood celebrity split history.

Meanwhile, the separation has got to be taking its toll on only child Suri. It appears Katie's keeping her daughter active and social, but encouraging her to meet new kids at the park and to integrate with other boys and girls her age. Suri has long been somewhat isolated by being out of school and with private tutors, taking private ballet lessons and staying unusually close to her mother.

Suri did make a friend today at the park -- the two rode the slide, compared notes about their bicycles ... hey, they were probably even discussing the Lance Armstrong debate! But whatever the girls talked about, little Suri looked as happy as we've seen her in a while ... until it was time to go!



Halle Berry took daughter Nahla and a pal (isn't that Kyle Richard and Mauricio Umansky's daughter Portia?) to Disney's El Capitan theater in Hollywood Saturday to see Cinderella.

Halle is still battling Nahla's dad, Gabriel Aubry in court over custody of their 4-year-old daughter. The Oscar-winning actress wants to pack up and move to France, with fiance Olivier Martinez, but reports claim the judge is unlikely to let it happen.

Even Berry's pal Salma Hayek submitted an amicus brief to the court, supporting Halle's claim the Nahla would be better protected from the media in France (Salma's hubby is French and they live in Paris most of the year).

Do you think Halle should be able to jump the pond to Europe and forbid Aubry from seeing their daughter for much of the year?

Leo DiCaprio hit the street to film The Wolf of Wall Street in New York, on Friday.

The hunky superstar will be back on the big screen with this movie about a New York stockbroker who refuses to cooperate in a large securities fraud case involving corruption on Wall Street, the corporate banking world and mob infiltration.

The film co-stars Jonah Hill, Matthew McConaughey, John Favreau and Jean Dujardin [The Artist].