She told E! Online: 'She's an amazing young woman and I feel really fortunate that she's in our lives.”
She added that a wedding could eventually be on the cards, even though Lavigne, 26, already has one divorce under her belt from Sum 41 singer Deryck Whibley.
'Not yet,' Linda said when asked about a potential engagement. 'I mean they're very young, they both have their careers to concentrate on. You never know what will happen but they are well suited for each other.”
Jenner, 27, has previously dated Hills co-star Lauren Conrad and socialite Nicole Richie.