In response to a tweet from Lowe on Aug. 7, in which he described himself as a "big fan," Dunham wrote: "What a day-maker you are! FYI I will probably mention you if I ever receive any award at all in my lifetime (and I too am a fan)."
Dunham was referencing an incident in 2000, when Lowe's then-wife, Hilary Swank, famously left him out of her thank-you speech when she won the Best Actress Oscar for Boys Don't Cry. And the Girls star made good on her pledge Sunday night when she accepted the award for Best TV Comedy/Musical Series.
"I also promised myself if I ever got this chance, I would thank Chad Lowe," Dunham said on stage. "I'm sorry, I just promised and I promised my mom."
When asked backstage why she thanked Lowe, Dunham responded, "Because Hilary Swank forgot! And because I'm an a--hole."
But the mention didn't come without a little prompting from Lowe. After Dunham gave a Lowe-free speech when she accepted her first award of the evening (for Best Actress in a TV Comedy/Musical Series), Lowe turned to Twitter once again to give her a little nudge.
"Congrats to @lenadunham on your Golden Globe win," he wrote. "But, seriously? You forget to thank me?! After all we've been through? I'm shocked."
After Dunham's second speech, Lowe tweeted: "Dearest @lenadunham YOU COMPLETE ME."
Dunham's response? "Mutual. It was time."