The former couple posed together at Clive Davis' Pre-Grammy Gala and Salute to Industry Icons in Beverly Hills on Sunday. Lavigne uploaded two smiling snaps with Kroeger to her Instagram account.
"Grammy Party ….. Feeling great. Lovely night," the 31-year-old singer captioned one.
Lavigne wore a floor-length, long-sleeve dress with lace on top. Kroeger opted for a simple black suit. The two looked cozy throughout the evening, leaning close to each other as they sat at a table with Alice Cooper, Paul Stanley and Gene Simmons.
The pair announced their separation last September after two years of marriage.
Kevork Djansezian / Getty
At the time, Lavigne broke the news in an emotional Instagram post, but wrote that she and Kroeger "are still, and forever will be, the best of friends."
The recent Grammy party isn't the first time Lavigne and 41-year-old Kroeger have been spotted out together.
In December, Lavigne and Kroeger were seen leaving a Los Angeles hotel together.
Just two months earlier, the performers reunited to write music together.
Reporting by REAGAN ALEXANDER