Nick Lachey reportedly proposed to Vanessa Minnillo but she turned him down. Nick, the ex-husband of Jessica Simpson, was reportedly crushed after the stunning MTV presenter rejected his offer of marriage proposal. A source told New Weekly magazine: "Nick would marry Vanessa tomorrow. She is the one who wants to take things slower. She is in no rush to become Mrs Nick Lachey."Now Nick, 33, is worrying their relationship may be doomed to fail because she is becoming more famous than he is. The source added: "It's the Jessica syndrome all over again. One of the reasons Nick and Vanessa's romance works is that he is the bigger star. ( What Star? ) Jessica's fame ruined their marriage and now Nick can't help but worry the same thing will happen to Vanessa."Nick's worries have increased since Vanessa landed a role in the next 'Fantastic Four' movie, along side renowned ladies' man Chris Evans.The source said: "Vanessa had a crush on Chris in the past and Nick knows it. Back then Chris was dating Jessica Biel, but now he's available and Nick is worried."