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Michael J. Fox was out in New York City on Wednesday morning -- aka "Back to the Future" Day -- sporting a pair of shoes he probably laced himself and getting into a car that does not go back in time.

For the uninitiated, October 21, 2015 is the date Marty McFly (Fox's character in the sequel) travels to when he goes into the future with Doc Brown to save his son from being arrested.

The movie's vision of the future included flying cars, self-drying jackets and the Chicago Cubs winning the World Series ... none of which is a reality this year.

Duty calls for Kendall and Kylie Jenner -- days after brother-in-law Lamar Odom's brush with death -- Kendall punched in for work, while her sis showed up for support.

The Jenner girls attended the Balmain x H&M launch event in NYC, where Kendall modeled on the catwalk. Kylie watched from the front row.

Both flew to Lamar’s bedside last week, and now that he's back in LA. and slowly improving ... it looks like Kendall and Kylie are getting back to everyday life. As much as possible, anyway.

Ob-la-di, ob-la-da ...

Kate Upton banged out a set of squats during a workout in West Hollywood with her personal trainer, who kept a watchful eye on ... her form.

Yes, he's actually getting paid to do this.

Chiwetel Ejiofor ... ahh who cares -- his new girlfriend is awesome!

The "12 Years a Slave" star took a stroll Tuesday in NYC with the stunning babe ... safe to say she's in head-to-head competition with the Oscar nominated actor ... 'cause she has a nice head.

It's the second time they've been spotted together ... they showed up at "The Martian" premiere as well. So far we don't know her name.

Nick Jonas and Kate Hudson have shown all the signs of being coupled up -- traveling together, dining together, even Disney-ing together -- right up until she gripped another dude in NYC.

Kate was on her way to a premiere Monday night hand-in-hand with the other guy ... who, btw, happens to be her agent -- and also happens to have been spotted holding Kate tight multiple times in recent months.

Yes, Jonas and Hudson were spotted together in multiple places last month, and as recently as last weekend.

So, who's really winning the Kate sweepstakes? Since people in the know tell us Nick and Kate weren't dating, just hooking up -- we'll guess BOTH for the block.

Lewis Hamilton has a need for speed ... even on the sidewalk.

The Formula 1 racer ditched his Mercedes for a different ride -- a Ninebot electric unicycle, which he rode while walking his adorable bulldog Roscoe over the weekend in Miami.

Diana Ross got several rolls of Charmin back in her arms again Sunday afternoon as she hit up a CVS in Bev Hills.

Chris Martin and new GF Annabelle Wallis couldn't keep their hands off each other Saturday afternoon in Paris ... kissing and dancing in the streets.

The Coldplay singer and the "Peaky Blinders" star have been dating since August, not long after Martin split with Jennifer Lawrence.

Gwyneth, Jennifer and Annabelle ... he definitely has a type.

Tyga is re-living the glory days when Kylie was by his side as she studied for her high school exams ... like 3 months ago.

Tyga and his 18-year-old GF were in downtown L.A. Friday night shooting a music video. The theme is becoming predictable, right?

Oh ... it is? Well, damn.

Bindi Irwin and Derek Hough got soaked practicing their latest routine for "Dancing with the Stars."

If you can't tell by the picture ... they're recreating the famous Patrick Swayze and Jennifer Grey dance lift from "Dirty Dancing" for next week's movie night -- and seem to have already nailed it.

Bindi and Derek are already in the lead on the scoreboard ... and they're not going anywhere.

Kate Hudson and Nick Jonas are still going strong ... in a new location this time, but we'll bet the end result was the same -- banging.

Nearly a month after they hung out in Disney World and Miami together, they popped up at the same Tribeca hotel in NYC. What a coincidence??!!

Nick slyly walked in just a few minutes before Kate showed up looking ridiculously hot, by the way ... baring her rock hard abs.

Kate is definitely dressed for the occasion.

Penelope Cruz is still hot enough to get U2 to play an entire concert ... JUST FOR HER -- at least that's what 24,000 people must have thought was happening in Barcelona.

Bono and co. played to a packed arena there this week, and when they made the mistake of inviting Penelope and hubby Javier Bardem on stage -- chica snapped pic after pic after pic as the band played on. She even had the lads pose for shots with Javier!

Imagine ... you pay through the nose to see 4 old Irish dudes rock out, and instead you end up with Penelope's bunny-ears-sporting-ass in your face.

Actually ...

Madonna has a superfan ... ex-husband Sean Penn, who was smack dab front and center at her Wednesday night concert in Vancouver.

Penn took in the show alongside Amy Schumer, who opened for Madge earlier on tour, but Penn only had eyes for his ex-wife.

It's the second time in a month he's caught his ex on the road, the last time being this past September in NYC.

All that staring might have paid off ... Madge dedicated the song "Secret" to a "special guest." The lyrics start, "Things haven't been the same since you came into my life, you found a way to touch my soul and I'm never, ever, ever gonna let it go..."

Secret's out?

Attention Tara Reid -- we now interrupt your Mexican vacay for shots of your BF caressing a tremendous bikini-clad ass ... that is NOT yours!

Not that Tara needed us to tell her, but yeah ... her dude, Yavuz Cansiz, shared a nice tight embrace with a female friend in Cancun while Tara got a bird's-eye view of the action.

As you'd expect, Yavuz had some 'splaining to do.

The last time Tara had this look on her face ... Kim Kardashian and Paris Hilton's asses were cruising by her.

8:30 AM PST -- Tara tells us the photos are misleading, since Yavuz isn't even her BF. Soooo ... grab all the ass ya want, dude!

Henry Cavill attempted to take his dog for a low-key walk in London, while sporting a commando sweatshirt -- not that low-key is possible for him ... with that face, and the whole Superman thing.

BTW, hands-free removal of dog poop. Now that would be a SUPER power.