Those in attendance this weekend at The Smashing Pumpkins' special In Plainsong LA performance at the Ace Hotel happened to witness an incredible reunion between lead singer Billy Corgan and his former guitarist, James Iha. Those familiar with the band understand that it has had a revolving door policy for members over the years, with Iha last playing with the Smashing Pumpkins 16 years ago. Well, in celebration of the former member's birthday, Corgan brought him on stage for the Siamese Dream portion of the concert. What happened next was simply history for the Pumpkins.

Alternative Nation was at the concert over the weekend, and captured some great photos when Iha came onto the stage. Once the crowd quieted down a bit from the excitement, Corgan and Iha jumped into some Siamese Dream songs, including "Mayonaise," "Soma," "Rocket," "Spaceboy," "Today," "Whir," and "Disarm."

Watch live video footage of the two former bandmates reuniting for a special performance of "Mayonaise" right here (via NME):

In an interview with Consequence of Sound that took place earlier in 2016, Corgan revealed that he'd like to make peace with his former band members, but didn't really show enthusiasm over a reunion.

"If they were lying on the side of the road, I would stop my car and bring them to the hospital, but we don't send Christmas cards to each other," he said at the time. "There's no relationship...There's no temptation there for me [for a reunion]. Strictly on my part I think it's like, 'Would I like to find peace?' Absolutely, of course. But beyond all the other stuff ... I can't even imagine that being able to watch."

It looks like he might've found that peace with Iha, and could be up for sending a Christmas card this year.

The In Plainsong tour continues into next month with the following dates:

Kingsbury Hall, Salt Lake City, UT (29)
Ellie Caulkins Opera House, Denver, CO (30)
The Fillmore, Detroit, MI (1)
Palace Theatre, Columbus, OH (2)
Beacon Theatre, New York, NY (4)
Tower Theatre, Philadelphia, PA (8)
Orpheum Theatre, Boston, MA (9)
Lincoln Theatre, Washington, D. C. (10)
Massey Hall, Toronto, Ontario (12)
Civic Opera House, Chicago, IL (14)
Palace Theatre, Louisville, KY (15)
Ryman Auditorium, Nashville, TN (16)
Majestic Theatre, Dallas, TX (18)
Bass Concert Hall, Austin, TX (19)
Cullen Performance Hall, Houston, TX (20)