Magaga gets their party on. Photo: Dimitrios Kambouris, WireImage for Marc Jacobs

When Lady Gaga and Madonna unite, they form one mega celeb.

When the two posed for pictures at the Marc Jacobs show yesterday, we couldn't help but wonder... IS THERE A DUET IN THE WORKS?

(Please please please...)

Madonna wore a lacy dress and leather jacket that reminded us of her punk 80's garb. But these days, there's nothing remotely punk about Madonna's look--especially when she stands next to Gaga.

The Lady is still trying to make that Phantom of the Opera look happen, this time with a black spiked masquerade-style mask (at the VMAs, she wore a gold one).

Want to supersize your fashion fix? See Magaga and more celebs at Spring 2010 Fashion Week:

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Celebrity Sightings: Spring 2010 Fashion Week
The stars were out for Fashion Week Spring 2010! Check out the familiar faces we found in the crowd.
Jemal Countess, Getty Images for Tommy Hilfiger
New Line Cinema/Warner Bros. Pictures

Celebrity Sightings: Spring 2010 Fashion Week

    Eva Mendes, Kerry Washington, Rose Byrne, and Thandie Newton attend the Calvin Klein Spring 2010 fashion show on September 17, 2009.

    Stephen Lovekin, Getty Images for IMG

    Kathy Griffin attends the Isaac Mizrahi Spring 2010 fashion show at Bryant Park on September 17, 2009.

    Bryan Bedder, Getty Images for IMG

    Molly Sims attends the Calvin Klein Spring 2010 fashion show on September 17, 2009.

    Stephen Lovekin, Getty Images for IMG

    Mary J. Blige, Serena Williams and Alicia Keys attend a cocktail party benefiting FAWN at Gucci Fifth Avenue on September 16, 2009.

    Jamie McCarthy, WireImage

    Miranda Kerr attends the Calvin Klein Spring 2010 fashion show on September 17, 2009.

    Stephen Lovekin, Getty Images for IMG

    Janet Jackson attends the Ralph Lauren Spring 2010 fashion show at Skylight Studios on September 17, 2009.

    Dimitrios Kambouris, WireImage

    Leighton Meester attends the Proenza Schouler Spring 2010 runway show Week at Milk Studios on September 16, 2009.

    Dimitrios Kambouris, WireImage

    Courtney Love attends the Proenza Schouler Spring 2010 runway show at Milk Studios on September 16, 2009.

    Dimitrios Kambouris, WireImage

    Rachel McAdams attends the Proenza Schouler Spring 2010 runway show at Milk Studios on September 16, 2009.

    Dimitrios Kambouris, WireImage

    Aerin Lauder attends the Proenza Schouler Spring 2010 runway show at Milk Studios on September 16, 2009.

    Dimitrios Kambouris, WireImage