But the reality is often subtler than that—career-wise, each superstar needed something from the other. Often, one act is a bit thirstier than the other. When you encounter one of these mega-duets, you should ask yourself, Who needed this more?

This week's Five Burning Questions looks at the first new No. 1 of 2025, with a song that's been in the top 10 for months already.

Lady Gaga and Bruno Mars' "Die With a Smile" secured a third consecutive week at No. 1 on the Billboard Hot 100 songs chart dated Jan. 25, 2025, and Mars is ready to party. "THANK YOU ALL!" he wrote alongside a cheers emoji and a screenshot of this week's top 10 on the chart.

Lady Gaga and Bruno Mars soar to No. 1 on the Hot 100 with “Die with a Smile,” as she collects her sixth ruler and he adds a ninth champion to his growing tally.

Nearly five months after the 38-year-old pop superstar teamed up with Bruno Mars for "Die with a Smile," the romantic ballad reached No. 1 on the Billboard Hot 100 on Jan. 6 — and Mother Monster took to social media with some celebrity posts.

ROSÉ and Bruno Mars' "APT." tops the Billboard Global Excl. U.S. chart for a 12th week. In November, the song debuted as the stars' second leader on each list. Plus, Bad Bunny charts five Global Excl.

Bruno Mars is ready to make a hit song with Sexyy Red. Mars, known for his epic collaborations, hopped on Instagram to celebrate his track with Lady Gaga, "Die With A Smile," topping the Hot 100 for the third week.