Sienna Miller walking her dog ... Rihanna getting out of an SUV ... Will Ferrell jogging near Union Square ... Matt Damon filming scenes for The Adjustment Bureau with Anthony Mackie in Brooklyn ... Paul Simon walking on Madison Avenue ... Ashton Kutcher and Demi Moore leaving their hotel ... Kevin Bacon walking on 14th Street ... Bruce Willis arriving at ABC for an appearance on GMA ... Calvin Klein eating lunch outside at Sant Ambroeus in the Village ... Angie Harmon carrying her daughter on Madison Avenue ... and John Mayer leaving Gemma on the Bowery after having dinner.
Fashion survivor Betsey Johnson turns 67 today. Real estate developer Harry Macklowe is turning 72. Actress Angie Harmon is 37. Author, political commentator and blogger Andrew Sullivan is turning 46. Model/actress Devon Aoki is turning 27. Rosanna Arquette is 50. Times art critic Roberta Smith is turning 62. Legendary federal judge Jack Weinstein is 88. Harriet Miers, who served as White House counsel under George W. Bush, is 64. Actor Justin Theroux turns 38. And Antonio Banderas celebrates his 49th birthday today.
• Both Katie Holmes and Nicole Kidman have active cases of herpes, reports Page Six, something you should probably keep in mind in the event either woman tries to plant a kiss on you. [P6]
• William H. Macy will take over for Jeremy Piven in Speed-the-Plow now that the Pivster has overdosed on sushi and will need to take time off to cleanse his sacred temple from mercury. [NYP]
• Marci Klein, SNL producer and daughter of Calvin, is calling it quits with her husband of eight years, Scott Murphy. [P6]
The pitter-patter of little feet is getting kind of annoying today at Defamer HQ, where news of not one, not two, not three, but four celebrity pregnancies and/or births have us hand-delivering sex-ed pamphlets to front desks everywhere from CAA to ICM. Even in this uncertain era of creative gas-rationing and looming SAG strikes, Hollywood seed is flying, and nowhere is it landing more conspicuously than in the always-competitive sphere comprising Matt Damon, Ben Affleck and Jennifer Garner; just when Damon and wife Luciana had welcomed Gia Zavala Damon into the cruel, cruel world, Garner confirmed her pregnancy with her and Affleck's own second child. Then, as the rivals regrouped to plot their escalation, Gwen Stefani and Gavin Rossdale went and blobbed at Cedars-Sinai:
Celebrating birthdays today: Real estate broker Deborah Grubman—who also happens to be the wife of Allen and stepmom of Lizzie—turns 56. Party planner extraordinaire David Monn is 45. Designer John Varvatos turns 54. Dustin Hoffman is 71. Two former boy band-ers, Drew Lachey and JC Chasez, both turn 32 today. Tennis star Roger Federer is 27. And Robin Quivers is 56. Saturday is the big day for Chris Cuomo (left) who will be celebrating his 37th. Michael Kors will be turning 49. Allure's Linda Wells will be 50. And real estate broker Larry Kaiser and designer Peter Marino will be a year older on Saturday, too. On Sunday: Fashion icon Betsey Johnson will be 66, actress Angie Harmon will be 36, and real estate developer Harry Macklowe will turn 71.