Ariana Grande kisses Big Sean onstage in Detroit, takes a tumble in Toronto

Ariana Grande, beau Big Sean surprise fans wiht duet during her Honeymoon Tour's stop in Detroit

Ariana Grande had a busy weekend filled with highs and lows, including PDA, an onstage fall and approval of boyfriend Big Sean's mother.

The petite pop star performed during her Honeymoon Tour on Saturday and Sunday and generated a couple of buzzworthy moments.

First, in her beau's hometown of Detroit, the "Break Free" singer and "Blessings" rapper surprised the audience of the Joe Louis Arena with a duet of "Big Mistake." A few songs later, the 21-year-old siren and the 26-year-old rapper shared a very public kiss onstage during "Right There" much to the delight of her fans.

"w my baby in the D #detroit #duh #NottheonlyDtho #what #gottagobye ¿¿¿¿ #ifyoudonthaveasenseofhumorpleaseunfollowme," the singer wrote on Instagram, sharing a selfie with the rapper.

The couple finally made their red carpet debt and confirmed their long-rumored relationship at the Grammy Awards in early February. The emcee, real name Sean Anderson, was previously engaged to "Glee" star Naya Rivera, but the duo reportedly called it quits in April. Meanwhile, TMZ got his mother to spill the beans on her son's newest lady love.

"We just saw her last night. She's just wonderful," she told photographers who questioned her at the airport while she was in the car with her son.

"Hey, hey, Ariana is amazing," he chimed in trying to halt the questions.

Then, his mom made a mea culpa face and continued her answer. "Yeah, she's great. Everybody, 20,000 people knew he was at the show last night with Ariana. She's fabulous."

Also on Sunday, Grande took a tumble onstage while performing her hit "Bang Bang" and hit the floor after tripping over a step in her platform boots. The Nickelodeon alum took a few seconds to pull herself together then continued the high-energy set during the Toronto concert.

After the show, though, she addressed the misstep on Twitter.

"thank u toronto!!!! tonight was such a fun show lol. y'all made me feel so much better! i love you & thank you so much," she wrote.

Hey, at least Mama still thinks she's fab.

Follow me on Twitter @NardineSaad.

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