Cameron Diaz was in a tight and short LBD last night to celebrate her 38th birthday in NYC at The Lion with her boyfriend Alex Rodriguez. Their special evening out was their latest adventure in a Summer full of fun together - they've been spotted taking in a Broadway show, mingling with their A-List pals and bonding with his kids. Cameron's taking it easy after her big promotional tour for Knight and Day ended, seeming happy to let A Rod have the spotlight as he tours the country playing with the Yankees.

Cameron Diaz looked low-key in jeans and sneakers as she hailed a cab in NYC yesterday. The actress has been spending lots of time in the city with her Yankee boyfriend, Alex Rodriguez, but last week she made a jaunt to California to relax in the sunshine in her bikini with friends. Cameron also rewarded herself with a Parisian shopping spree alongside her stylist, Rachel Zoe's assistant, Brad Goreski, earlier this Summer after wrapping up her promotional duties for Knight and Day. Meanwhile, Cameron's Oscar gown played a big part in this week's The Rachel Zoe Project, which added to this season's exciting new drama.

The overturning of Prop 8 has us wondering if Brad Pitt will soon marry Angelina Jolie, since he once said he'd tie the knot when everyone had the same right, Cameron Diaz and Alex Rodriguez spend time in NYC together, and Neil Patrick Harris directs Vanessa Hudgens at a rehearsal for Rent. Watch today's all-new PopSugar Rush!

Tom Cruise and Cameron Diaz were guests on the very entertaining British car show, Top Gear. I used to watch this show with my husband (we can’t get it where we live now, but we’re going to rent it on Netflix on demand now that I’m reminded!) and it’s surprisingly entertaining for all genders and non-car enthusiasts alike. I’m not a car person at all and I love this show. They pull all sorts of fun stunts that can also be very dangerous, as evidenced by the very serious accident that co-presenter Richard Hammond suffered in 2006. Hammond has since fully recovered after a brain injury and is back on the show.

Tom Cruise and Cameron Diaz separately raced a Kia around a track as part of Top Gear’s “reasonably priced car” race event, and I’m not going to post spoilers to the above video in this text because I want you to watch it and see for yourself! There are spoilers in the link to E!’s text quoted below. (The text itself doesn’t contain that spoiler.) I know it’s silly to talk about “spoilers” for a TV show, but if you watch the video you’ll see why I want to keep the suspense going. It’s fun and will brighten up your day:

Well if the movie thing stops working out (and, after the release of Knight and Day, you never know…), at least Tom Cruise and Cameron Diaz can fall back on race-car driving.

Cruise and Diaz tore up the track during a joint appearance on the BBC’s Top Gear on Sunday, both zipping through the course in astounding time—with the Mission: Impossible star narrowly averting a potentially dangerous accident.

[Cruise's near-miss is about at the three-minute mark in the clip above]

To promote the U.K. launch of their action flick, the actors got behind the wheel of a Kia for a segment called “Star in a Reasonably Priced Car” and attempted to break the course record held by Harry Potter star Rupert Grint.

Diaz, wearing her best game face and dropping her best F-bombs (”some of this is actually broadcastable,” quipped host Jeremy Clarkson), went first and flew around the circuit, just edging Grint’s time.

Then came Cruise, who at the end of his ride drifted off the track and briefly went up on two wheels but managed to bring the car back down without killing himself.

[From E! Online]

For all you can say about Tom Cruise, he is a really good sport and he kept his composure while on the track. He was so calm when racing around while Cameron was swearing like a trucker! That may have a lot to do with the fact that Tom has extensive experience racing cars, having starred in the 1990 film Days of Thunder.

Knight & Day may not have cleaned up at the box office, but it’s hanging in there. So far it’s grossed $161.78 million worldwide and had a production budget of $117 million, according to Box Office Mojo. Add in the DVD sales and it’s in the black, although it surely didn’t make as much as the studio is hoping for. I’ll probably catch it on DVD. Cruise is not my favorite person, but I can suspend disbelief when I see him on film. He plays crazy so well.

Also, don’t Tom and Cameron seem really cozy with each other? If Cameron was getting touchy feely like that with any other co-star there would definitely be affair rumors.

Tom Cruise and Cameron Diaz are shown at premieres of Knight & Day in London (gray sweater dress, 7/22/10) and in France (black and white dress, 7/23/10). Credit: WENN.com

Cameron Diaz was able to take time off from her Knight and Day promotional tour to shop in Paris on Saturday with a young friend and Rachel Zoe's assistant Brad Goreski - ICYMI, check out our awesome collaboration with Rachel in which she battles the Zoeinator! Rachel and Cameron have worked together for a long time, and the style assistance came in handy with the actress's recent premieres in Munich, London, and Bordeaux. Cameron was casual, though, for a recent meet and greet with the leader of the Tour de France. Cameron picked something gray for dinner last night at the city's Maison de la Truffe.

To see more Cameron, just read more.