Lady Gaga, Katy Perry, and Ben Affleck: Hottest Star Sightings of the Day (PHOTOS)

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Celebrities were busier than ever this weekend, thanks to countless premieres and the autumn rush of going back to school.

Hollywood mommies and daddies were spotted taking their tykes to class and helping out with their kids’ heavy backpacks. Joel Madden balanced holding his daughter Harlow’s hand while carrying her lunchbox to their car.

Meanwhile, on the East Coast, Katie Holmes walked Suri into Avenues – her new school in the Chelsea neighborhood of New York.

Click after the jump to see what else celebs were up to.

Lady Gaga supported her beau, Taylor Kinney, for the premiere of his new NBC series, Chicago Fire. The 26-year-old singer snapped photos with fans and even snuck Kinney a kiss for good luck.

Jennifer Garner joined Ben Affleck in Paris while he was promoting for his new film Argo over the weekend, and the two spent the afternoon shopping in the French capital. The Afflecks stopped in Bonpoint to pick up some new duds for their three children, Violet, 6, Seraphina, 3, and Samuel, 8 months.

Katy Perry and John Mayer had a romantic night out in New York City on Sunday. The on-again couple went to Pearl restaurant and a private nightclub afterwards.

For more star sightings of the day, check out the latest edition of celeb snaps, above.

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