The former Hills star, who is set to tie the knot with musician and law student William Tell, said her soon-to-be hubby's proposal came sooner than she expected.
"I had no idea it was coming," she told Cosmopolitan. "I thought he would wait until he finished law school."
As for her engagement ring, which she showed off on her blog, Lauren said she had no input on it, adding, "He didn't even ask my friends, which was a bold move. He said, 'I know you, and I know what you like.' And I love it. It's perfect."
The 27-year-old fashionista, who covers the mag's January 2014 issue, advised ladies to not rush for the ring, saying, "You have the rest of your life to be married. Enjoy falling in love. When girls get caught up in the timeline, it becomes more about the wedding than the marriage. You should be with someone with whom you could elope this weekend and be happy."
And she also dished on settling down and not settling for just any old guy.
"William hates it when I say this, but he really is a very nice guy, and when you meet a nice guy who also manages to keep your interest, that is the dream."
"If you're going to settle down, it should be with someone you can't stop thinking about. Especially if you're in your 20s. If I were single in my 60s, I would totally settle. I would!"
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Gallery | Celebrity Engagements