Despite their Christmas festivities, celebrities spent the week getting engaged, getting arrested, and getting some shopping done. Here's what went down:

• Mom jean lover [1] Mischa Barton was arrested Thursday on DUI charges [2] and later bailed out by her mother [3]. It remains to be seen whether she'll be hosting a NYE party [4] as scheduled in Las Vegas.
• Britney Spears befriended a paparazzo [5] last weekend, shared Christmas custody [6] of the boys with Kevin and then resumed her wild ways [7] by week's end.
• Despite not wanting to be pregnant in her wedding dress [8], Jessica Alba announced her engagement [9] to Cash on Thursday and showed off her newly acquired bling [10] on a shopping trip.
• Not to be outdone, Fergie also showed off her diamonds [11] after getting engaged to Josh Duhamel [12].
• Paris rounded up the rest of the Hilton clan for a holiday trip to Hawaii [13], where her 18-year-old brother made headlines [14] for a change and the family found out that their inheritance will be smaller than expected [15], before heading back to LA for a party at Goa [16].
• After Riley sold his story [17] to a UK tabloid, Lindsay packed her bags for LI to spend time with her family [18] before taking to the skies [19] once again to accept an award [20] honoring her film career in Capri.