Author: Debbie Emery, Philiana Ng

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Jimmy Fallon brought back his “Tight Pants” sketch on Monday night, this time with Jennifer Lopez joining in on the fun.

Both sang about their white skinnies, competing for tight pants supremacy. “Listen up you little b—,” Lopez playfully confronted Fallon, both wearing bowl-cut wigs, ridiculously colorful shirts and skin-tight white pants.

Things got real when J. Lo schooled Fallon on the merits of her winning pair of “tight pants.” Of course, the skit wouldn’t be complete without a cheeky closeup shot on Lopez’s behind.

On Seth Meyer‘s Late Night, Lena Dunham gave her interpretation of Sia‘s “Chandelier,” complete with blonde-wigged head shaking and prancing in a white trouser suit.

During his opening monologue, Meyers talked about California Chrome failing to win the Triple Crown on Saturday, but reasoned that despite the loss in the Belmont “it is just another Monday for California Chrome, in fact he probably doesn’t even know we have days of the week.”

The host went on to wish “our good friend” Tracy Morgan a speedy recovery after being involved in a serious car crash. “We love you Tracy and we hope you get well soon.”

VIDEO: Jimmy Fallon Unveils Top 10 Reasons David Letterman is Retiring

Channing Tatum and Jonah Hill continued their press tour for 22 Jump Street by visiting Conan O’Brien and telling the host about their raunchy bet over how much the comedy sequel would make in its opening weekend. “There is a key piece of fabric in the story,” revealed Hill. Taum won the bet — and Hill’s “gambling career came to an abrupt end.”

On CBS, David Letterman welcomed Kelsey Grammer, who will appear in three of the summer’s big blockbusters. “I did a Transformers thing in which I am the bad guy, which is a lot of fun, and I’m in Sylvester Stallone‘s movie, The Expendables 3,” he said, along with making a cameo in X-Men: Days of Future Past.

VIDEO: Seth Meyers on ‘Late Night’ Jitters, Lorne Michaels’ Advice and Leaving His Dream Job

The Frasier star also revealed his biggest fan, who even got his face tattooed on her arm with his signature under it.

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What do gerbils, breadsticks and mullets have in common?

They were all words featured in Jimmy Fallon‘s latest game, “Word Sneak,” which he played with Ricky Gervais on Monday’s The Tonight Show episode. 

The aim was to fit the words seamlessly into conversation, which prompted some very strange references to Richard Gere and Duck Dynasty.

Macklemore and Ryan Lewis have produced some of the last two year’s biggest hits — such as “Thrift Shop,” “Same Love” and “Can’t Hold Us” — but could an everyday person pick Lewis out of the crowd?

The DJ/producer took to the streets to ask just that. Wearing glasses and with hair slicked back, Lewis polled several New Yorkers about their familiarity (or lack thereof) with the lesser-known half of the duo. Let’s just say the majority preferred Macklemore, who even made a surprise appearance at the end of the Tonight Show segment, with one fan giving Lewis a “C+” in attractiveness.

Over on ABC, Jimmy Kimmel played a game called “Don’t Talk Into the Mic,” where fans failed to win $10 simply by keeping their mouths shut. First guest Dr. Phil then marveled at why Jimmy would want another baby after having two grown up children already. “I am very fertile,” claimed the host.

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His next guest, ESPN’s Sage Steele, admitted that having children was a professional help rather than hindrance for her as a female sports reporter. “Once I got knocked up [by her husband] the athletes wanted nothing to do with me!” she said of having three children in four years while covering the Baltimore Ravens.

As for her current duties as host of NBA Countdown with analysts Bill Simmons and Jalen Rose. “I get these guys who are really smart and love what they are doing. The key is to making it really conversational.”

VIDEO: Charlize Theron, Josh Harnett Play Charades With Jimmy Fallon

Seth Meyers did a joint interview with Megan Mullally and Nick Offerman on Late Night, where they dished on past and future projects.

“I have never been a performer who people hired because I look good,” said 22 Jump Street co-star Offerman, who went to claim that he’d been given some key buzz words to describe the Channing Tatum and Jonah Hill cop comedy. “Action, summer, comedy, penis, big.”

Meanwhile, Mullally had some big news for Broadway fans, “I am coming back to do a play on Broadway called It’s Only a Play, with Nathan Lane and Matthew Broderick,” she announced.

Donald Trump joined David Letterman on CBS, where he talked about who else but Donald Sterling. “I do know him…he’s turned out to be not so hot. What a total disaster,” he said.

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Jimmy Fallon announced on Monday that The Tonight Show will be going on its first road trip to Orlando, Fla. from June 16-19, where they will visit that the Harry Potter Diagon Alley theme park and drink butterbeer in the Hog’s Head pub. 

The musically-talented host went on to do a freaky skit called “Nip Syncing,” which featured a slicked-up (and very buff!) Fallon with Blended star Terry Crews doing a shirtless performance of “Ebony and Ivory,” as their pecs did synchronized dance moves.

He went on to welcome A Million Ways to Die in the West star Liam Neeson, who was excited to be playing a cowboy in the comedy. “At the start of this year, I had nine films,” said the hardworking action star, revealing that four of them were animated, before telling Fallon how his kids previously made fun of him being featured on co-star/director Seth MacFarlane‘s Family Guy.

VIDEO: Emma Stone Takes on Jimmy Fallon in Lip Sync Battle

Godzilla hit theaters on Friday, earning $93 million in the domestic box office in opening weekend, and to celebrate the film’s release, Jimmy Kimmel debuted a new installment of “Lie Witness News,” asking every day people on the street how they felt about Hollywood “glamorizing” the 1954 giant lizard attack that killed 100,000 in Tokyo. “It’s a travesty!” one said, while another was in support of a proposed $600 million bill that would equip the government with anti-reptile capabilities. 

Guest George Stephanopoulos later dropped in a Godzilla reference when Kimmel mentioned his conversation with President Clinton about UFOs, along with telling the Jimmy Kimmel Live! host what it was like to work with Barbara Walters.

On CBS, David Letterman met some wild creatures of a fluffy nature, when Jack Hanna brought in a laundry basket full of adorable baby penguins.

PHOTOS: Godzilla Over the Decades

Later on NBC, Seth Meyers chatted with X-Men: Days of Future Past star Patrick Stewart, and Counting Crows frontman Adam Duritz, who admitted that he considered quitting the band at one point.

“I just thought it [their music] was going to be depressing, I didn’t think people would find it therapeutic,” he told the Late Night host, as for naming people in songs like “Mr. Jones,” he replied: “No one has gotten pissed off at me, I generally give them good reviews.”