The couple divorced in 2006 after nearly four years of marriage, and Lachey has since gone on to wed Vanessa Minnillo.
© WENN
Nick Lachey
© ABC
Jessica Simpson
Lachey revealed on Watch What Happens Live that he doesn't have much interest in discussing his former marriage because it had been "probably six years" since he last saw Jessica.
"It's like another lifetime ago," he told host Andy Cohen.
Lachey then appeared to allude to rumours about former father-in-law Joe Simpson's sexuality when asked what he likes best about not having Joe in his life anymore.
© Rex Features / NBC
Nick Lachey
© Rex Features / Sipa Press/Rex Features
Jessica Simpson, father Joe Simpson
The 98 Degrees star quipped: "I don't have to play grab-ass under the table!"
Joe recently finalised his divorce from wife Tina Simpson after several months of legal wrangling.
Watch Nick Lachey discuss his marriage to Jessica Simpson below:
