Kim Kardashian and Pete Davidson are living on cloud nine, and the comedian cementing his relationship with the reality TV star's children certainly adds to those emotions.A source tells ET that Kim and Pete are «super serious and in love.» The source adds that «they are talking about their plans going forward as a couple.» The source says that the former star being so great with Kim's four children — North, 9, Saint, 6, Chicago, 4, and Psalm, 3 — is something Kim «really loves and appreciates» about him.«Seeing him with her children has made her fall even harder for Pete,» the source says. «Kim and Pete are very invested in each other and feel closer than ever.